Darned Short Throated .45-70

[cult .44]

I finally managed to get my hands on some Speer 400 gr JFPs but, after reading the FAQ about the Handi's short throat, I set about measuring how long a cartridge it would take with this bullet.

Answer = 2.50"

My Hornady 300 gr JHPs and 350 JRNs chamber just fine at the standard 2.55".

The good news is that I have some Hornady LeverEvolution brass which is on the short side so I can seat the 400 gr bullet to the front cannelure and stay at or under 2.50". But I'm thinking I need to moderate the charges for the short COL.

How much difference does a 20th of inch make in terms of pressure? Anybody have experience with this?

[quickdtoo]

Hodgdon levergun data shows that bullet loaded to 2.540", use start data and work up, depending on the powder used, start pressures are all 31kcup or less, some a lot less, which should give you plenty wiggle room considering their modern rifle data goes to 50kcup. Crimping isn't essential in a Handi, so regular brass will work fine too.  Just be sure the bullet is loaded off the lands, starting the bullet in the lands will boost start pressure over 7kcup.

Tim

http://data.hodgdon.com/main_menu.asp

[cult .44]

Just be sure the bullet is loaded off the lands

Thanks. That was the question I forgot to ask.