.45ACP barrel length?

[Murmur]

Theres the heap of info at this link http://www.teppojutsu.com/458.htm
Makes me think that the 1 1/2" 45/70 could be fun. The case capacity is looks close to the socom, cases are easy to get and will suit the contender. The above web site lists that a 1-14 twist will handle 500-600gr bullets at sub speeds even with a short barrel. Anybody have a link to a twist rate calculator to confirm what barrel twist would be required if I went down the 1 1/2" 45/70 route with 500-600gr bullets at sub speeds?

[d-mon]

I will try to put my hand on a very good one i have somewhere on my computer.
Far better than the greenhill formula.

ND

[tp555]

The 458 socom has the same head size as the 308 or base if you want to call it
that.The ar bolt can be machined to .510" which is about the max.Tromix made and sold ar's in 50 AE which has the .510 dia bolt faces. It required a special extractor. So does the socom. Machining the ar bolt to .510 leaves a paper thin
amount of material from the original round part. The bolt held up to the pressures and worked.The biggest cal in an ar15 is the 510 phantom. It is 510 cal same blank as 50bmg. The bolt face is .530".to do this they use olympic
arms wssm parts.The bolt.bolt carrier,upper and barrel extension are redesigned
and bigger then the standard ar15 parts. I had the opportunity to examine a wssm barrel recently.regards.