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Test results from 338 ST *pics and chronograph data*

 
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  #1  
Old 04-22-2006, 12:43 PM
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Location: Nebraska
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Test results from 338 ST *pics and chronograph data*

338 SnipeTac rifle

Viersco custom repeater action(3 shot), stainless steel
Barney Lawton stainless barrel, 33" 1x11.25 twist
Holland style brake
Lone Wolf carbon fiber stock
6x24 IOR 35mm tube scope
Tuned rem 700 trigger
Total weight 16.75# with magazine
Cases formed from 408 CheyTac necked to 338cal
Neck length .350
H2O capacity 165grns
Overal length w/ 300MK bullet 4.150 (touching lands)

Today i did some testing with US869 powder, 300MK bullets.
The cases were blank fire formed before starting.

The first test was 147 grns of US869 Hodgdon. Bullet was seated to just touch lands. Group was .750 at 100yds, no pressure signs. The chronograph was set at 10 feet from muzzle. Three shots were, (3426 clean bbl), 3454, 3464.

Next three shots i bumped up the load to 150grns of US869.
I did not clean. 3505, 3525, 3520. The first two shots cut an oblong hole, third shot was just off a bit, could of been me? As you can see in the pics, my bench is very poor. The group size was .533 Extraction was easy, shows some signs of the primer starting to flatten. Maybe able to bump up the load to 152. Temp outside was 65deg. Light wind from the left. Recoil was moderate, i could shoot this all day. I feel 3500fps is plenty fast and i am going to call this my top load. I'm sure i could get 3550-3600fps, if you wanted to push it to the limit, you may also cut the barrel life down and loose some cases. Remember this is a carry rifle for hunting. 3500fps with the 300MK bullet is very impressive out of a 33" tube.

I'm hoping to test some 350grn WC bullets tomorrow.

[image][/image]
Pic of 100yd target, 150grns of Hodgdons US869 powder, 300MK
3520 fps

[image][/image]

[image][/image]

Pic of rifle on my portable bench

[image][/image]



Dave
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  #2  
Old 04-22-2006, 02:22 PM
daveosok
 
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Re: Test results from 338 ST *pics and chronograph data*

Dave thats some good info.

What would you expect from a 40 inch barrel?
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  #3  
Old 04-22-2006, 02:24 PM
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Join Date: Jun 2002
Location: middle Tennessee
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Re: Test results from 338 ST *pics and chronograph data*

That's some SWEET equiptment!!! [img]/ubbthreads/images/graemlins/cool.gif[/img]
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  #4  
Old 04-22-2006, 02:27 PM
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Join Date: Nov 2004
Location: El Reno, OK
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Re: Test results from 338 ST *pics and chronograph data*

that is one damn impressive rig!!!! I cannot believe a 300gr bullet at 3500fps!!!!! I almost feel sorry for whatever is centered in your cross hairs. I am excited to see what you get out of the 350gr uld , then i wanna see what Kirby can get out of it with his longer bbl.

is your gun a repeater???? Some time over the next year or two I am gonna get some kinda big 338 in a repeater for elk and bear hunting. I really like the Kahn but I i like to keep my options open. I cannot imagine the power of a 325gr flatbase bonded bullet slamming into a brown bear at 3350fps, OUCH!!!!!

Dont feel bad about the bench, the one me and BJ shoot off of is a POS!!!! Most of the time we just lay on the ground, except during summer in Oklahoma, you catch a sandbur in the nipple it hurts!!! [img]/ubbthreads/images/graemlins/blush.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]

Looks like one hell of a gun

take it easy
steve
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  #5  
Old 04-22-2006, 02:59 PM
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Join Date: Jun 2004
Location: Fort Shaw, Montana
Posts: 6,796
Re: Test results from 338 ST *pics and chronograph data*

BD408,

Congrats on an obvious successful test session. Seems US869 will offer a bit more then H-50BMG will get us in the big 408 based 338s!!!

How are primer tightness at 3500 fps. Curious how long the primer pockets last over repeated firings at this level. Yet to get mine tuned up and on the range. Will hopefully fireform some cases tomorrow and get her out to the range is possible. Will try some US869 and see what happens.

One tech question for you, what is the diameter of your firing pin?

Congrats again!!! Good building, good loading, good shooting!!! [img]/ubbthreads/images/graemlins/grin.gif[/img]

Kirby Allen(50)
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  #6  
Old 04-22-2006, 04:32 PM
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Join Date: Sep 2003
Location: Nebraska
Posts: 811
Re: Test results from 338 ST *pics and chronograph data*

Kirby:

So far the primer pockets are still tight. I measured the expansion on the web area, its right at .004 so i think the 150grn load is about tops without ruining the brass, at least in this gun.

I turned this firing pin to .069 there is very little crater on the primer. Im using a 25# spring also, i have a 27# but dont think i need it.

In the process of cutting a FL size die, my reamer is a bit small so i have to hone the body out so i dont over size the brass. I figure about .001 undersize is plenty. We will see. As soon as this is done i can load up some 350's. I'm hoping for 3400 with them.

Later

Dave
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  #7  
Old 04-22-2006, 05:06 PM
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Re: Test results from 338 ST *pics and chronograph data*

Where are you getting US869 Hodgdon?
Crow Mag
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