Top Velocity in a Marauder .22?

Top Velocity in a Marauder .22?

Joined: August 14th, 2011, 2:52 pm

August 29th, 2011, 2:03 am #1

I have a Marauder .22 cal. I have the velocity adjustment cranked on its highest setting. I get 810 fps with baracuda match 21.14 grain at 2700 psi. And 880 fps with 18.1 grain JSB Diablo Exacts. I have heard of people getting up to 880 with the baracudas. What am I doing wrong?
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Joined: November 5th, 2008, 8:23 pm

August 29th, 2011, 2:14 am #2

have to say about this also.
I'm getting 860fps with 21.14 barracudas in my Disco and I always thought
the M-rod was a stouter more powerful rifle.
In fact, I was thinking about getting one based on that very reason.
Ray
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Joined: January 16th, 2011, 9:27 pm

August 29th, 2011, 2:58 am #3

I have a Marauder .22 cal. I have the velocity adjustment cranked on its highest setting. I get 810 fps with baracuda match 21.14 grain at 2700 psi. And 880 fps with 18.1 grain JSB Diablo Exacts. I have heard of people getting up to 880 with the baracudas. What am I doing wrong?
"velocity adjustment cranked on its highest setting"?

There are 3 separate adjustments that can affect the velocity. For maximum velocity you would want the spring tension at maximum Clockwise, the stroke length adjustment at maximum counter clockwise and the transfer port adjustment wide open, also counter clockwise.

Not saying that is how you should have it adjusted as it would probably yield a terrible shot count, but that would demonstrate how much velocity you could get and which way you want to turn each adjustment to increase your velocity to the desired level.
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Joined: August 14th, 2011, 2:52 pm

August 29th, 2011, 3:07 am #4

e open and the maximum amount of air is going through. What is the maximum velocity that I should get with the baracudas and diablo 18.1 grain?
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Joined: January 16th, 2011, 9:27 pm

August 29th, 2011, 3:16 am #5

try increasing hammer spring tension and/or stroke length. Also what pressure are you filling to? Are you measuring the velocity for an entire shot string or just at one fill pressure level? The velocity will vary as the pressure in the reservoir changes and your peak velocity will be in the middle of the shot string.
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Joined: May 31st, 2005, 5:24 am

August 29th, 2011, 6:09 am #6

I have a Marauder .22 cal. I have the velocity adjustment cranked on its highest setting. I get 810 fps with baracuda match 21.14 grain at 2700 psi. And 880 fps with 18.1 grain JSB Diablo Exacts. I have heard of people getting up to 880 with the baracudas. What am I doing wrong?
i have experimented with my mrod up and down the scale. which pellet is most accurate, then i start working the velocity. my mrod loves the jsb 15.9 pellets and also the polymags. i kept going up on the velocity keeping track of my adjustments. i try to get more velocity with the hammer spring and just go a quarter turn at a time on the meter screw. seems to keep my shot string longer and more consistent. anyway i'm getting 930-940 for about 25 shots with my .22 mrod using either polymags or 15.9 jsb's. i can go higher, but the accuracy and shot strings suffer. i use mine mostly for hunting and a polymag out of a .22 cal at 930-940 fps is deadly on squirrels and rabbits 9 times out of 10 with a pass thru. i've taken squirrels out to probably 60-70 yards.
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Joined: August 14th, 2011, 2:52 pm

August 30th, 2011, 1:47 am #7

How do you adjust the hammer?
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Joined: September 16th, 2008, 10:57 pm

August 30th, 2011, 2:00 am #8

I have a Marauder .22 cal. I have the velocity adjustment cranked on its highest setting. I get 810 fps with baracuda match 21.14 grain at 2700 psi. And 880 fps with 18.1 grain JSB Diablo Exacts. I have heard of people getting up to 880 with the baracudas. What am I doing wrong?
Aloha
Now go out & shoot!
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Joined: May 31st, 2005, 5:24 am

August 30th, 2011, 4:34 am #9

How do you adjust the hammer?
insert an allen wrench (can't remember the size but it's about 1/4 or 5/16) and turn clockwise about a half turn at a time and chrony and be sure to log everything so you can go back to the factory setttings if necessary.
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Joined: May 6th, 2010, 4:26 pm

August 31st, 2011, 1:34 am #10

I have a Marauder .22 cal. I have the velocity adjustment cranked on its highest setting. I get 810 fps with baracuda match 21.14 grain at 2700 psi. And 880 fps with 18.1 grain JSB Diablo Exacts. I have heard of people getting up to 880 with the baracudas. What am I doing wrong?
Sam,

Read the A-Team procedures on the main Crosman PCP page. You probably won't understand it the first time through, but keep reading it and thinking through it, and once you do understand it, it bring a lot of things into focus for you.

But as I said on the other forum, you'll need to get all four things lined up if you want to find out the max velocity that your gun is capable of - high hammer spring preload, long hammer travel, wide open transfer port, and a full fill. And even then you may find that there is more in the gun for your valve at a slightly higher fill pressure. That is what I found on mine.

But once you find that out, you will wnat to tune it back to a usable shot count and curve per the A-Team's procedures. Those are gold a a learning tool.
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