Green Mountain .45ACP Barrel Blank?


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jkpq45
October 3, 2012, 04:33 PM
Is anyone of the opinion that I could rechamber this beast to a longer/higher-pressure round than .45ACP?

http://www.gmriflebarrel.com/barrelblanksround/175-round-rifle-barrel-blanks/45-acp-heavy-raw-blank,-175-x-125-4140,-116

I'd love to do .454 Casull or .460 S&W Magnum, even if I have to stay on the lower end of pressures.

-jkpq45

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rcmodel
October 3, 2012, 04:44 PM
I would think it would handle the pressure.
But the twist rate might be a little fast for either of the Magnums.

The GM barrel is 1/16.
.460 S&W is 1/20 gain twist.
.454 is often 1/24.

rc

jkpq45
October 3, 2012, 06:10 PM
.45 Colts can be 1 in 16 or 1 in 38, as I recall--all depends on the manufacturer.

So, with a faster twist, would I want lighter bullets? Say in the 250-300gn range for either .454 or .460?

rcmodel
October 3, 2012, 07:14 PM
Faster twist will handle heavier bullets.

Probably will make no differance with lighter bullets as you really can't over-stabilize them.

It could increase pressure with max loads though.

rc

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