GPR .54 Velocity?

Moloch · October 17, 2009, 03:10 PM

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!

B.L.E. · October 17, 2009, 03:38 PM

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.

Moloch · October 18, 2009, 05:36 PM

Thank you!

October 17, 2009, 03:10 PM	#1
Moloch Senior Member Join Date: November 27, 2005 Posts: 1,419	GPR .54 Velocity? 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!

October 17, 2009, 03:38 PM	#2
B.L.E. Senior Member Join Date: December 20, 2008 Location: Somewhere on the Southern shore of Lake Travis, TX Posts: 2,603	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.

October 18, 2009, 05:36 PM	#3
Moloch Senior Member Join Date: November 27, 2005 Posts: 1,419	Thank you!