Heavy 45-70 (RCBS 500gr/LFNGC) and AR-Comp Powder

mehavey · June 12, 2012, 09:12 PM

I picked up a Remlin GBL today, and afterwards began rummaging around in my old
moulds drawer from my Sharps 45x3-1/4 days to find my what I had from 30 years ago.

Out popped my RCBS 45-500 FNGC.

Next I went to my 48th & 49 Lyman (& Cast) handbooks to find nothing that heavy
other than in the Ruger#1 section; ...and then finally to a really old spiral-bound Ideal
manual (60's I remember) to finally find loadouts for the Lyman 500gr 457406 mould.

Then I went to QuickLoad and ran a propellant table analysis looking for options other
than "the usual suspects" of 3031, 4198, 4227, RL-7, etc.

Out popped brand new AR COMP of all things. It came out waaaay far and ahead of
anything else for that bullet at pressures under 30,000psi. I mean THE top: Full case,
and full (97%)burn with the top velocity predicted of 1,470fps from an 18.5" barrel.

Before I start playing around in earnest, has anyone here had any real field experience
w/ AR COMP in the 45-70?

June 12, 2012, 09:12 PM	#1
mehavey Senior Member Join Date: June 17, 2010 Location: Virginia Posts: 6,886	Heavy 45-70 (RCBS 500gr/LFNGC) and AR-Comp Powder I picked up a Remlin GBL today, and afterwards began rummaging around in my old moulds drawer from my Sharps 45x3-1/4 days to find my what I had from 30 years ago. Out popped my RCBS 45-500 FNGC. Next I went to my 48th & 49 Lyman (& Cast) handbooks to find nothing that heavy other than in the Ruger#1 section; ...and then finally to a really old spiral-bound Ideal manual (60's I remember) to finally find loadouts for the Lyman 500gr 457406 mould. Then I went to QuickLoad and ran a propellant table analysis looking for options other than "the usual suspects" of 3031, 4198, 4227, RL-7, etc. Out popped brand new AR COMP of all things. It came out waaaay far and ahead of anything else for that bullet at pressures under 30,000psi. I mean THE top: Full case, and full (97%)burn with the top velocity predicted of 1,470fps from an 18.5" barrel. Before I start playing around in earnest, has anyone here had any real field experience w/ AR COMP in the 45-70?