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February 13, 2012
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I’m wanting to build some rounds for a 45 win mag. The COL listed in
the 7th edition of the Hornady handbook for their 300 grain HP XTP
is 1.480”. In order to properly chamber and allow me to rack the round out of the weapon I have to set this bullet to a COL of 1.445”. I was planning on using 2400 just because I have some on hand so that will be 14.6gr to a max of 16.4gr. I’m wondering if I should be concerned about the pressure due to the difference in the available space in the shell casing.
If the weather was better and a bit less snow around I would start at the lowest level and check for signs of pressure and shoot them over a chronograph. But that’s at least another month or more away! I’d rather not wait so would appreciate your opinions.
Thanks,
Glen
November 23, 2008
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Good morning
As 2400 is a somewhat slow pistol powder I would start at the low end and work up to where you want to be with velocity / function.
Your difference in OAL is not that considerable. If you were already at max pressure loads then there would be some possible pressure problems especially if the bullet was snugged against the lands. But from what I read in your OP by starting out with the low load your are not going to see any problems. 2 grains of 2400 in the 45 Win Mag easily takes up .045 inches.
I have a Contender barrel in this cartridge and it makes sweet music with 285 grain cast on whatever it smacks.
Mike in Peru 
February 13, 2012
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Thanks Mike. Hornady's reply to my questions was that the differance was enough to concern them. Or maybe their lawyers? LOL! Thinking I'll just pick up some lighter bullets with a more gradual profile. I shoot lots of cast bullets out of my 1911's but expected that I would have a leading problem shooting them at the velocities I expect to get out of this caliber; so your comment on your cast bullet load intrigues me.
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