Tokarev Magnum?

[barnbwt]

I have a favor to ask of someone with Quickload (two, in fact ;D)
1) Could you generate a pressure/distance plot of a 'standard' 7.62x25 load for a 16" barrel?*
2) Could you generate the same plot for a x25 loaded to 223 max pressure of 50ksi?**
3) Bonus points for a third plot of #2 using a slower, magnum pistol powder

*I'm designing a gas-operated 7.62x25 carbine, and it'd be nice to have an estimate of chamber/barrel pressure at the point I'm tapping off gas, as well as an idea of how much energy I'll have to work with at that point.
**I'm playing with the idea of trimming/necking down 223 brass like we'd normally do to make tok brass, only to a .308 inside neck diameter with no reaming, and then loading it to full-on 223 pressures for a sort of "Tokarev Magnum" whose neck will be too fat to fit in a true 7.62x25 chamber.

I appreciate the help, as well as any leads if anyone has heard of this wildcat, before. Also, if anyone happens to know if there would be any shoulder left whatsoever if the 223 case wall were squeezed down to a .308 inside diameter vs. the Tokarev outside diameter. I know it won't be much.

TCB

 

[mackg]

7.63 Mini Whisper (on 7.63 Mauser)
7.62 Micro Whisper (on 7.62 Luger)

Not quite what you want but you might like the idea .

Look at the 300 Whisper for shoulder matters.

 

[barnbwt]

How much thicker is the case halfway back vs the neck, though?

 

[mackg]

http://www.cartridgecollectors.org/cmo/cmoindex.htm

 

[barnbwt]

Thanks for the link; I don't suppose the case-making dies that form the interior vary a whole lot maker-to-maker (at least the case wall thickness)? A cursory glance at those shown looks like a 10% or so increase in thickness, so probably not super noticeable so long as we aren't constrained by 308 bullets and a 7.62x25 spec chamber.

TCB

 

[mackg]

You might have to try different ones. Military brass has a rep for being thicker (where?).

I know that revolver brass can vary a lot for wall thickness, and as to where the "head" starts thickening too.

 

[barnbwt]

Good point; it would probably be best to buy a big lot of a couple thousand rounds of 223 (for the AR70, or course ) then convert it to my hot, "new," PDW round as I go along . Anybody able to make an estimate of what kind of performance increase I could expect from a 7.62x25 soup-ed up to 50ksi?

Clark?

TCB

 

[mackg]

So you know Clark and you're askin' us questions..!!!

I almost put a link to some post on gunboards, but since it was about 9 Superplus and the TT33 platform I didn't.

Btw, in old times when no-good doers were trying to hot rod their 38 Super without blowing cases, they used 223 brass. You sure you don't want a 9x23 carbine and convert your pistols...?

http://www.thehighroad.org/showthread.php?t=520878