Review of the Redesigned .177 JSB Monster pellet

Joined: June 20th, 2017, 7:33 pm

December 3rd, 2017, 12:21 am #1

Here's my unscientific review of the "Redesigned" .177 Monster pellet from JSB.
After waiting for months while my order of the new design Monster was on back order, I finally received a couple of tins and did a little comparison of the original vs. new design.



I first weighed individual pellets from both designs. Similar to the original design pellet, only around 30% of the redesigned Monster pellets in the tin were actually 13.4 gr. Some were heavier or lighter give or take a tenth of a grain. That may not be a big deal, but just for consistency I only used 13.4 gr. from both the original and new design for this test.



The change of pellet shape from old to new is obvious, but the skirt of the redesigned Monster looks identical to the original. The redesigned tin of pellets I sorted seemed a bit dirtier than the original design tin I sorted, as my fingers were dark gray by then end of handling 400 pellets one by one.




Off to the sight in range! Weather was overcast with practically no wind and temperature around 54°. I'm testing these pellets with a non-regulated Gen 1 Marauder with a LW barrel, from a table with a bipod attached. I use this rifle for Hunter Field Target so it’s tuned to around 20 FPE. My scope is a UTG 12x, and I did not adjust or click my scope in any way during this test. I recorded the velocity of each shot of my groups shot at 55 yds. Before shooting each group of pellets I filled the gun to 2700 lbs. First I shot a small group at my 25 yd. zero with each type of pellet. As you can see, the original Monsters were on zero, and the new designed Monsters shot a bit lower- about 1/4" lower. I noticed the new design pellet fits a bit tighter in the breach than the original.





At 55 yds I filled the rifle back up to 2700 lbs. for each group. I shot two, 10 round groups of each pellet design at 55 yds. As you can see, my best group from the original design pellet was slightly better at 7/8", but I had a couple of fliers that I can not explain. The redesigned Monster group was 1".



The velocity from each group was similar and I didn't see a big difference there.




So what are your thoughts? Which would you use?
Next step will be to test my grouping of original Monster vs. new Monsters in the wind.

Thanks for reading,
Philip Hepler
Member of the Tar Heel Air Gun Club- hosts of the 2018 AAFTA Field Target Nationals
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Joined: November 17th, 2006, 3:51 am

December 3rd, 2017, 2:57 am #2

Thanks for the write up.

Have been kind of dreading the "improved" version. Have a couple of .177's that really shoot well with the "old" version, and sure-as-ship, the old version is going to be replaced with the new.

Hopfully, the differnce won't be disproportionate.
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Joined: September 1st, 2012, 10:04 pm

December 3rd, 2017, 5:26 am #3

Here's my unscientific review of the "Redesigned" .177 Monster pellet from JSB.
After waiting for months while my order of the new design Monster was on back order, I finally received a couple of tins and did a little comparison of the original vs. new design.



I first weighed individual pellets from both designs. Similar to the original design pellet, only around 30% of the redesigned Monster pellets in the tin were actually 13.4 gr. Some were heavier or lighter give or take a tenth of a grain. That may not be a big deal, but just for consistency I only used 13.4 gr. from both the original and new design for this test.



The change of pellet shape from old to new is obvious, but the skirt of the redesigned Monster looks identical to the original. The redesigned tin of pellets I sorted seemed a bit dirtier than the original design tin I sorted, as my fingers were dark gray by then end of handling 400 pellets one by one.




Off to the sight in range! Weather was overcast with practically no wind and temperature around 54°. I'm testing these pellets with a non-regulated Gen 1 Marauder with a LW barrel, from a table with a bipod attached. I use this rifle for Hunter Field Target so it’s tuned to around 20 FPE. My scope is a UTG 12x, and I did not adjust or click my scope in any way during this test. I recorded the velocity of each shot of my groups shot at 55 yds. Before shooting each group of pellets I filled the gun to 2700 lbs. First I shot a small group at my 25 yd. zero with each type of pellet. As you can see, the original Monsters were on zero, and the new designed Monsters shot a bit lower- about 1/4" lower. I noticed the new design pellet fits a bit tighter in the breach than the original.





At 55 yds I filled the rifle back up to 2700 lbs. for each group. I shot two, 10 round groups of each pellet design at 55 yds. As you can see, my best group from the original design pellet was slightly better at 7/8", but I had a couple of fliers that I can not explain. The redesigned Monster group was 1".



The velocity from each group was similar and I didn't see a big difference there.




So what are your thoughts? Which would you use?
Next step will be to test my grouping of original Monster vs. new Monsters in the wind.

Thanks for reading,
Philip Hepler
Member of the Tar Heel Air Gun Club- hosts of the 2018 AAFTA Field Target Nationals
fit better in your magazines? Can't tell in your photo if you're using a shot tray in your gun.

The originals will catch the holes in the clear plastic with the skirt edges.
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Joined: April 4th, 2013, 7:07 pm

December 3rd, 2017, 5:50 am #4

Here's my unscientific review of the "Redesigned" .177 Monster pellet from JSB.
After waiting for months while my order of the new design Monster was on back order, I finally received a couple of tins and did a little comparison of the original vs. new design.



I first weighed individual pellets from both designs. Similar to the original design pellet, only around 30% of the redesigned Monster pellets in the tin were actually 13.4 gr. Some were heavier or lighter give or take a tenth of a grain. That may not be a big deal, but just for consistency I only used 13.4 gr. from both the original and new design for this test.



The change of pellet shape from old to new is obvious, but the skirt of the redesigned Monster looks identical to the original. The redesigned tin of pellets I sorted seemed a bit dirtier than the original design tin I sorted, as my fingers were dark gray by then end of handling 400 pellets one by one.




Off to the sight in range! Weather was overcast with practically no wind and temperature around 54°. I'm testing these pellets with a non-regulated Gen 1 Marauder with a LW barrel, from a table with a bipod attached. I use this rifle for Hunter Field Target so it’s tuned to around 20 FPE. My scope is a UTG 12x, and I did not adjust or click my scope in any way during this test. I recorded the velocity of each shot of my groups shot at 55 yds. Before shooting each group of pellets I filled the gun to 2700 lbs. First I shot a small group at my 25 yd. zero with each type of pellet. As you can see, the original Monsters were on zero, and the new designed Monsters shot a bit lower- about 1/4" lower. I noticed the new design pellet fits a bit tighter in the breach than the original.





At 55 yds I filled the rifle back up to 2700 lbs. for each group. I shot two, 10 round groups of each pellet design at 55 yds. As you can see, my best group from the original design pellet was slightly better at 7/8", but I had a couple of fliers that I can not explain. The redesigned Monster group was 1".



The velocity from each group was similar and I didn't see a big difference there.




So what are your thoughts? Which would you use?
Next step will be to test my grouping of original Monster vs. new Monsters in the wind.

Thanks for reading,
Philip Hepler
Member of the Tar Heel Air Gun Club- hosts of the 2018 AAFTA Field Target Nationals
Shooting groups with different head sizes would be better. For example, my Poly barrel TM likes 4.53 better than 4.52.
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Joined: February 28th, 2011, 4:45 pm

December 3rd, 2017, 12:20 pm #5

Here's my unscientific review of the "Redesigned" .177 Monster pellet from JSB.
After waiting for months while my order of the new design Monster was on back order, I finally received a couple of tins and did a little comparison of the original vs. new design.



I first weighed individual pellets from both designs. Similar to the original design pellet, only around 30% of the redesigned Monster pellets in the tin were actually 13.4 gr. Some were heavier or lighter give or take a tenth of a grain. That may not be a big deal, but just for consistency I only used 13.4 gr. from both the original and new design for this test.



The change of pellet shape from old to new is obvious, but the skirt of the redesigned Monster looks identical to the original. The redesigned tin of pellets I sorted seemed a bit dirtier than the original design tin I sorted, as my fingers were dark gray by then end of handling 400 pellets one by one.




Off to the sight in range! Weather was overcast with practically no wind and temperature around 54°. I'm testing these pellets with a non-regulated Gen 1 Marauder with a LW barrel, from a table with a bipod attached. I use this rifle for Hunter Field Target so it’s tuned to around 20 FPE. My scope is a UTG 12x, and I did not adjust or click my scope in any way during this test. I recorded the velocity of each shot of my groups shot at 55 yds. Before shooting each group of pellets I filled the gun to 2700 lbs. First I shot a small group at my 25 yd. zero with each type of pellet. As you can see, the original Monsters were on zero, and the new designed Monsters shot a bit lower- about 1/4" lower. I noticed the new design pellet fits a bit tighter in the breach than the original.





At 55 yds I filled the rifle back up to 2700 lbs. for each group. I shot two, 10 round groups of each pellet design at 55 yds. As you can see, my best group from the original design pellet was slightly better at 7/8", but I had a couple of fliers that I can not explain. The redesigned Monster group was 1".



The velocity from each group was similar and I didn't see a big difference there.




So what are your thoughts? Which would you use?
Next step will be to test my grouping of original Monster vs. new Monsters in the wind.

Thanks for reading,
Philip Hepler
Member of the Tar Heel Air Gun Club- hosts of the 2018 AAFTA Field Target Nationals
To determine which pellet to use shoot twenty 5 shot groups with each, carefully measure the groups and get an average group size for each pellet. Interesting on the targets you pictured it appears original strings vertically and the new horizontally.
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Joined: July 19th, 2003, 12:46 pm

December 3rd, 2017, 12:39 pm #6

Here's my unscientific review of the "Redesigned" .177 Monster pellet from JSB.
After waiting for months while my order of the new design Monster was on back order, I finally received a couple of tins and did a little comparison of the original vs. new design.



I first weighed individual pellets from both designs. Similar to the original design pellet, only around 30% of the redesigned Monster pellets in the tin were actually 13.4 gr. Some were heavier or lighter give or take a tenth of a grain. That may not be a big deal, but just for consistency I only used 13.4 gr. from both the original and new design for this test.



The change of pellet shape from old to new is obvious, but the skirt of the redesigned Monster looks identical to the original. The redesigned tin of pellets I sorted seemed a bit dirtier than the original design tin I sorted, as my fingers were dark gray by then end of handling 400 pellets one by one.




Off to the sight in range! Weather was overcast with practically no wind and temperature around 54°. I'm testing these pellets with a non-regulated Gen 1 Marauder with a LW barrel, from a table with a bipod attached. I use this rifle for Hunter Field Target so it’s tuned to around 20 FPE. My scope is a UTG 12x, and I did not adjust or click my scope in any way during this test. I recorded the velocity of each shot of my groups shot at 55 yds. Before shooting each group of pellets I filled the gun to 2700 lbs. First I shot a small group at my 25 yd. zero with each type of pellet. As you can see, the original Monsters were on zero, and the new designed Monsters shot a bit lower- about 1/4" lower. I noticed the new design pellet fits a bit tighter in the breach than the original.





At 55 yds I filled the rifle back up to 2700 lbs. for each group. I shot two, 10 round groups of each pellet design at 55 yds. As you can see, my best group from the original design pellet was slightly better at 7/8", but I had a couple of fliers that I can not explain. The redesigned Monster group was 1".



The velocity from each group was similar and I didn't see a big difference there.




So what are your thoughts? Which would you use?
Next step will be to test my grouping of original Monster vs. new Monsters in the wind.

Thanks for reading,
Philip Hepler
Member of the Tar Heel Air Gun Club- hosts of the 2018 AAFTA Field Target Nationals
out of my Rapid. Very interesting..
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Joined: June 4th, 2013, 4:42 am

December 3rd, 2017, 3:19 pm #7

To determine which pellet to use shoot twenty 5 shot groups with each, carefully measure the groups and get an average group size for each pellet. Interesting on the targets you pictured it appears original strings vertically and the new horizontally.
Could explain the vertical stringing but it doesn’t generally cause horizontal so I’m not sure what to make of it unless the wind conditions happened to be worse when shooting the new Monsters.

I never tried the .177 Monsters due to how awful the .22 were. Just a couple of days I ordered some of the redesigned pellets in both calibers to try out so I’m looking forward to that.
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Joined: August 13th, 2008, 10:45 am

December 3rd, 2017, 4:36 pm #8

Here's my unscientific review of the "Redesigned" .177 Monster pellet from JSB.
After waiting for months while my order of the new design Monster was on back order, I finally received a couple of tins and did a little comparison of the original vs. new design.



I first weighed individual pellets from both designs. Similar to the original design pellet, only around 30% of the redesigned Monster pellets in the tin were actually 13.4 gr. Some were heavier or lighter give or take a tenth of a grain. That may not be a big deal, but just for consistency I only used 13.4 gr. from both the original and new design for this test.



The change of pellet shape from old to new is obvious, but the skirt of the redesigned Monster looks identical to the original. The redesigned tin of pellets I sorted seemed a bit dirtier than the original design tin I sorted, as my fingers were dark gray by then end of handling 400 pellets one by one.




Off to the sight in range! Weather was overcast with practically no wind and temperature around 54°. I'm testing these pellets with a non-regulated Gen 1 Marauder with a LW barrel, from a table with a bipod attached. I use this rifle for Hunter Field Target so it’s tuned to around 20 FPE. My scope is a UTG 12x, and I did not adjust or click my scope in any way during this test. I recorded the velocity of each shot of my groups shot at 55 yds. Before shooting each group of pellets I filled the gun to 2700 lbs. First I shot a small group at my 25 yd. zero with each type of pellet. As you can see, the original Monsters were on zero, and the new designed Monsters shot a bit lower- about 1/4" lower. I noticed the new design pellet fits a bit tighter in the breach than the original.





At 55 yds I filled the rifle back up to 2700 lbs. for each group. I shot two, 10 round groups of each pellet design at 55 yds. As you can see, my best group from the original design pellet was slightly better at 7/8", but I had a couple of fliers that I can not explain. The redesigned Monster group was 1".



The velocity from each group was similar and I didn't see a big difference there.




So what are your thoughts? Which would you use?
Next step will be to test my grouping of original Monster vs. new Monsters in the wind.

Thanks for reading,
Philip Hepler
Member of the Tar Heel Air Gun Club- hosts of the 2018 AAFTA Field Target Nationals
As with rimfire chamber size , bore dia, Twist, and velocity all come into play.
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Joined: June 4th, 2013, 4:42 am

December 3rd, 2017, 5:15 pm #9

True but at the same time, consensus is these factors tend to be less important with pellets. Probably the clearest practical example is twist rate. A flare stabilized projectile (diabolo pellet) doesn’t need much spin to fly straight. The extremely slow rate of twist delivered by a Smooth Twist is a good example.

The pros say the chamber / leade is less critical dimensionally and geometrically.

The role of velocity is less clear. Some have experimented with running the longer pellets like the Monsters over a wide range of velocities without a clear pattern emerging. If memory serves, the most compelling report I’ve seen was regarding a Thomas shooting them around 800fps in a much slower twist, and doing so well enough to win a competition. That runs counter to rimfire logic where the longer projectile benefits from a faster twist rate.

Lastly, even sizing is less critical. The skirt obturates to form a seal and as long as the head rides the rails, to borrow yrrah’s phrase, it seems the resulting accuracy is often quite good. He put up a nice experiment where he downsized pellets quite a lot before accuracy diminished. Again from memory, I think it was below 4.47mm which by most would be considered unacceptably undersized. Surely not all barrels would be as tolerant to the same degree but it does call into question the conventional wisdom regarding head sizes.

With that said, put all those in a blender with some barrel harmonics and a dash of wind and who can tell what’s important?



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Joined: November 16th, 2013, 3:47 am

December 3rd, 2017, 6:59 pm #10

Indeed Sir. Nice summation my friend! Nft
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