GPR .54 Velocity?

Moloch

New member
Hi!

I have just a short question, I have a Lyman great plains rifle in .54 and I am shooting .540 conicals with 300 grains with very good results with 75 grains of 3FG swiss powder.

I am asking for a rough guess of velocity? Any ideas?

I know, I need to get my chronograph! :o
 
My guess is about 1300 to 1400 fps based on my observation that every grain of black powder is good for about 15 to 17 ft-lb of muzzle energy depending on bore diameter and barrel length and powder brand.
 
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