Author Topic: Darned Short Throated .45-70  (Read 361 times)

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Offline cult .44

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Darned Short Throated .45-70
« on: February 22, 2010, 05:55:23 AM »
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?
"Our knowledge increases each year. Yet what we know is as trivial as a whisper in a vast desert."
     - Robert A. Pinker, "Understanding Firearm Ballistics"

Offline quickdtoo

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Re: Darned Short Throated .45-70
« Reply #1 on: February 22, 2010, 06:10:16 AM »
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

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Offline cult .44

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Re: Darned Short Throated .45-70
« Reply #2 on: February 22, 2010, 11:34:55 AM »
Quote
Just be sure the bullet is loaded off the lands

Thanks. That was the question I forgot to ask.
"Our knowledge increases each year. Yet what we know is as trivial as a whisper in a vast desert."
     - Robert A. Pinker, "Understanding Firearm Ballistics"