.308 bigbore in progress

.308 bigbore in progress

Joined: February 5th, 2009, 1:39 pm

May 25th, 2011, 9:58 pm #1

Or should I say "Work in Progress"..I've been working on my own .308 cal Crosman Disco based rifle for a while now, when I can fit in some time between Jobs.
Here's what I'm using at this time:
Roller trigger
Stainless steel Breech & Barrel Band
27" 7/8"OD Stainless Steel tube
26" barrel from Mike@ TJ's
One of my Fluted Strikers
16lb Striker spring
Rear Cocking Kit
And the important part, a new prototype valve system I've been working on for a while.
Here are some of the results of the latest Try Out
Three shots using 171gr bullets, starting fill pres. 3400lbs
#1=717 fps 195fpe
#2=699.6 185fpe
#3=672.3 171fpe
Remaining pressure 2150lbs.
That's an average speed of 696.3fps at a cost of 413psi per shot.
And using the Crosman plastic stock, the whole package weight comes in just under 4 1/2lbs, and requires a cocking effort that is relatively light.
Still a bit of fine tuning to do before the new valve is ready for Prime Time, but it's real close. I'll keep you posted on the progress.
Don C.
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Joined: October 3rd, 2010, 3:22 pm

May 26th, 2011, 3:26 pm #2

nt
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Joined: March 9th, 2004, 11:21 pm

May 27th, 2011, 12:47 am #3

Or should I say "Work in Progress"..I've been working on my own .308 cal Crosman Disco based rifle for a while now, when I can fit in some time between Jobs.
Here's what I'm using at this time:
Roller trigger
Stainless steel Breech & Barrel Band
27" 7/8"OD Stainless Steel tube
26" barrel from Mike@ TJ's
One of my Fluted Strikers
16lb Striker spring
Rear Cocking Kit
And the important part, a new prototype valve system I've been working on for a while.
Here are some of the results of the latest Try Out
Three shots using 171gr bullets, starting fill pres. 3400lbs
#1=717 fps 195fpe
#2=699.6 185fpe
#3=672.3 171fpe
Remaining pressure 2150lbs.
That's an average speed of 696.3fps at a cost of 413psi per shot.
And using the Crosman plastic stock, the whole package weight comes in just under 4 1/2lbs, and requires a cocking effort that is relatively light.
Still a bit of fine tuning to do before the new valve is ready for Prime Time, but it's real close. I'll keep you posted on the progress.
Don C.
I've had some power house rigs but nothing as light as that which sounds better every year. And ya, where are ours pictues?
Keep us posted,
John

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Joined: February 5th, 2009, 1:39 pm

May 27th, 2011, 3:09 am #4

I have a picture of the gun it looks pretty plain I need a good stock for it. This morning I shot a 120 gran bullet over 2 1/2" deep at 74 yards away, into the wood light pole I have on my land.

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Joined: November 6th, 2007, 5:29 pm

May 27th, 2011, 6:03 pm #5

Hey don you really can't make it out..Any chance you can resize the pictures..
Wayne
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Joined: March 9th, 2004, 11:21 pm

May 29th, 2011, 8:30 pm #6

I have a picture of the gun it looks pretty plain I need a good stock for it. This morning I shot a 120 gran bullet over 2 1/2" deep at 74 yards away, into the wood light pole I have on my land.

A good friend of mine has a FT pistol worked up with your parts included. I would love to have a 3000psi tube on my Discovery.
John

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Joined: February 5th, 2009, 1:39 pm

May 30th, 2011, 1:04 am #7

Send me an email.
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Joined: June 3rd, 2002, 3:50 am

May 30th, 2011, 2:14 am #8

Or should I say "Work in Progress"..I've been working on my own .308 cal Crosman Disco based rifle for a while now, when I can fit in some time between Jobs.
Here's what I'm using at this time:
Roller trigger
Stainless steel Breech & Barrel Band
27" 7/8"OD Stainless Steel tube
26" barrel from Mike@ TJ's
One of my Fluted Strikers
16lb Striker spring
Rear Cocking Kit
And the important part, a new prototype valve system I've been working on for a while.
Here are some of the results of the latest Try Out
Three shots using 171gr bullets, starting fill pres. 3400lbs
#1=717 fps 195fpe
#2=699.6 185fpe
#3=672.3 171fpe
Remaining pressure 2150lbs.
That's an average speed of 696.3fps at a cost of 413psi per shot.
And using the Crosman plastic stock, the whole package weight comes in just under 4 1/2lbs, and requires a cocking effort that is relatively light.
Still a bit of fine tuning to do before the new valve is ready for Prime Time, but it's real close. I'll keep you posted on the progress.
Don C.
......or 1.4 K over the working pressure mine is marked for.
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Joined: February 5th, 2009, 1:39 pm

May 30th, 2011, 5:23 pm #9

Hi I just made the tube out of 304 Stainless as are all my stainless tubes.
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