.50-95 Chapperall twist

[hawkeye2]

           I measured the twist in my Chapperall 76 in .50-95 and got 1/2 turn in 18" or 1 turn in 36" give or take a little.  I marked my cleaning rod, put on a duct tape flag and used 2 patches for a tight fit so I could be off a little but close.  I have to dig for the formula and run the numbers but in actuality my choices will be either a Rapine 320 gr. or a Lyman 340 gr. as I have those molds.  The bore is .509 + to .510 and I have a .512 die for my Lyman.  

[larryo_1]

Hawkeye:

If you want to really check it out, use the Greenhill formula for bullet length vs twist.  that will tell you pretty close what you want for weights.

[hawkeye2]

    That was the formula I was refering to but I don't remember right offhand where among all my material it is.  I'll still be limited to the bullets mentioned, it's about $$.

[FriscoCounty]

L = bullet length in inches D = bullet diameter in inches T = twist in inches

T = 150 * D* D / L

Lead weighs 2867.78 grains per cubic inch