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Test results from 338 ST *pics and chronograph data*

 
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  #8  
Old 04-22-2006, 05:22 PM
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Re: Test results from 338 ST *pics and chronograph data*

Lerch:

This gun started as a single shot, then i milled the bottom out for my detachable magazine system. It uses a 3 shot clip, similar to a 788 rem. Feeds very well, single stack mag. I can build them to hold more rounds but they get too long for my taste.

I made lots of the 338-378wby wildcats in the past, the only thing i dont like is the Belted case. I would go with the 338-416 rigby imp. The brass is better and the same results.

Dave
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Old 04-22-2006, 05:25 PM
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Re: Test results from 338 ST *pics and chronograph data*

Crow Mag:

I got my US869 from Graf & Sons. www.grafs.com
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  #10  
Old 04-23-2006, 08:43 AM
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Re: Test results from 338 ST *pics and chronograph data*

I tested the 350grn Wildcat bullets this morning. The results were not good. My barrel twist will not stabilize the long heavy bullets. I feel you will need a 10 or under for this. All my new SnipeTac rifles have a 9.25 twist, this barrel was a prototype i had made several years ago for testing this new round. With any new wildcat it takes time and lots of testing to find the proper twist rates. This is a whole new area when you contiplate running 300gr bullets over 3400fps, spin rate becomes an issue, just how much can the bullet take? Therefore you are experimenting with twist rates, can get expensive, or get lucky on the first try! This twist will work ok for 300 and smaller bullets. I have shot 200grn Noslers in this barrel, they all go into the same hole at 100yds, 3900fps. Not an ideal choice for hunting or barrel life, was just for fireforming and test loads at the time.

I shot several of the 147grn loads with the 300MK for sighters. It was 55deg out today and light winds. The same load yesterday at 65deg produced 3420 on ave. Today with 10 deg cooler temp it was 3375fps ave.

I loaded up 3 test loads with the 350grn bullets, 142, 143, 144 with US869. All loads opened easy, little resistance on the last load. Velocity was from 3140, 3160, to 3205fps highest being the last load. I was mostly looking for what speed the 350grn will be capable of running. The recoil was no different from the 300MK.

More testing will be needed with the new 9 twist barrels when i get one done.

Dave
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  #11  
Old 04-23-2006, 09:29 AM
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Re: Test results from 338 ST *pics and chronograph data*

BD408,

I was curious to see what would happen with the 350 gr ULD RBBTs in your 1-11.25 twist. I have tested them in my 1-10 twist 338 Kahn at 2800 fps and accuracy was VERY good at ranges under 300 yards but seemed to open up at longer ranges and would not hold as tight as the 300 gr ULD RBBT at 3050 fps.

I figured you may get about the same results with your slower twist barrel but as you correctly mentioned, with these wildcats we are playing in uncharted waters. No one knows what will happen until bullets get in the air and that can be a spendy situation which I know very well as I know you also know very well.

Your velocities are about exactly where I was expecting them to be. I suspect you will top out in the 3200 to 3250 fps range but again, thats just a guess on my part.

You will not have a problem overstressing these bullets with your 1-9 twist I am sure. They have a pretty stout jacket on them. With this much bullet weight and length combined with this huge powder charge you may see a measureable increase in pressure for a given load comparing the 1-11 twist to the 1-9 twist.

I know you will start lower but just want to be your conscience a bit here!!! [img]/ubbthreads/images/graemlins/grin.gif[/img]

Still, a 350 gr ULD RBBT at 3200 fps.... Damn, right at 8000 ft/lbs of energy ain;t to bad in a .9 BC bullet!!!

Keep us posted. I hope to get some cases formed today and load up some test loads here soon as well. Will let you know how my bullets fly in the 1-10.

Kirby Allen(50)
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  #12  
Old 04-23-2006, 03:08 PM
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Re: Test results from 338 ST *pics and chronograph data*

Do you have a pic of a 350g WC bullet next to a 300g SMK?
What are you using to fire forming?
Crow Mag
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  #13  
Old 04-23-2006, 09:49 PM
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Re: Test results from 338 ST *pics and chronograph data*

BD 408,
How do you like that prochrono, are they any good?
Oh, and by the way....freakin awesome rifle, looks like you could use a new bench [img]/ubbthreads/images/graemlins/grin.gif[/img]
How much did that lighten your checkbook? [img]/ubbthreads/images/graemlins/cool.gif[/img]
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  #14  
Old 04-23-2006, 10:17 PM
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Re: Test results from 338 ST *pics and chronograph data*

HOLY ************* [img]/ubbthreads/images/graemlins/shocked.gif[/img]

I just ran some numbers on the 300 SMK at 3500!!!

only 15 inches drop at 1000, WITH A 100 YARD ZERO!!!!!

I am speechless.............. [img]/ubbthreads/images/graemlins/shocked.gif[/img] [img]/ubbthreads/images/graemlins/shocked.gif[/img]
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