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416 Barrett vs. 375/408 SOE

 
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  #8  
Old 07-18-2006, 07:57 PM
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Re: 416 Barrett vs. 375/408 SOE

JD;

The BMG cases will go past 50,000 some fella's are loading them up too 65,000# That is max for any case due to brass becomes semi liquid at 70,000# The 50 spotter round is loaded with a 835gr projectile at 2350fps mil specs. That is moving for the large bullet and small case, there has to be some high chamber pressures there. The big thing is with the 50 cal case you get the larger case head and heavy webbing. The Action is larger and can take more thrust. Re-sizing the full size 50BMG case can be real fun if you run the loads hot, takes a hell of a press to handle that squeeze. I dont plan on loading mine over 55,000 for starters, but who knows where it will top out at. But so far this project is on the drawing table, test results are the only way to see how efficient the case is going to be.

Kirby is working on a 50cal in the chey-tac case, wont know the speeds until he shoots it, my guess is a 750amax around 2300fps. And yes the cases will take a beating.

Short bbl guns usually loose around 300fps over the standard length, that is why the long range pistol shooters can do so good with the same chamberings, 18-20" bbl lengths that is. I ran the numbers on the Snipe-Tac with a 20" bbl, it was right at the 300fps loss range. A 300grn MK pushing 3000fps out of a 20" bbl Would make a neat mountain rifle.

Dave
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Old 07-18-2006, 08:48 PM
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Re: 416 Barrett vs. 375/408 SOE

Triggerfifty;

So far every Barney bbl i have got has been good, several 408's, 338's and a 308. All have been under 1/2moa.

I did have trouble with LRB 408 bullets in the past, they were to say the least, very eratic. I had several conversations with Warren about them also. He pretty much denied any thing wrong, i have heard they got rid of him but i have not used any of the LRB bullets since then. I still have several boxes left. We started using the Barnes bullets, they shoot very very good in the 408's. Aver groups are smaller than the LRB counterparts.

We have AR400 steel plates at our range, and few mild steel plates left over. The 300gr MK at 800yds with make a 3/4" dia hole through the 5/8 thick mild steel plate. The AR steel it will make splash dents in it. I can no longer shoot at any of the plates hanging at the range [img]/ubbthreads/images/graemlins/grin.gif[/img]
I have to hang paper or bring my own plates. At 400.00 per silouete they say im wrecking them. A 300win mag just knocks the paint off of them. They accused me of shooting a BMG on the range, i said its just a 338 mag. They didn't believe me, so i had to show them. Like i said before, my first intention was to build the 375-408, but std hunting bullets wasnt what i was looking for, ok for out to 800yds i suspect.
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Old 02-27-2013, 08:02 AM
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Re: 416 Barrett vs. 375/408 SOE

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