The Firing Line Forums - View Single Post - 45-70 N130 medium loads

T. O'Heir · October 11, 2018, 01:48 PM

It's the "extra light" 7.5 lbs. rifle part that's kicking you. Not the bullet weight itself. 70 grains of BP with a cast 405 out of a TrapDoor Carbine just hurts to shoot.
Use the 400 grain data on Vihtavuori's site. 44 grains of N130 is .7 below minimum for a jacketed bullet too.
"...went as low as 40 grains..." That is an exceedingly unsafe thing to do. Below minimum loads can be as dangerous as above Max loads.
https://www.vihtavuori.com/reloading.../?cartridge=57
A 405 grain bullet at 1330 FPS out of a 7.5 pound rifle has 18.7 ft-lbs of recoil energy according to Chuck Hawks(sounds light to me. Dunno where he got those numbers. There's no smokeless load that comes close to 1330 FPS. Unless it's the original BP load.). Compared to a 350 grain at 1900 FPS that has 37.9 out of a 7 pound rifle. The 405 at 1800 FPS will be similar to the lighter bullet.

October 11, 2018, 01:48 PM	#14
T. O'Heir Senior Member Join Date: February 13, 2002 Location: Canada Posts: 12,453	It's the "extra light" 7.5 lbs. rifle part that's kicking you. Not the bullet weight itself. 70 grains of BP with a cast 405 out of a TrapDoor Carbine just hurts to shoot. Use the 400 grain data on Vihtavuori's site. 44 grains of N130 is .7 below minimum for a jacketed bullet too. "...went as low as 40 grains..." That is an exceedingly unsafe thing to do. Below minimum loads can be as dangerous as above Max loads. https://www.vihtavuori.com/reloading.../?cartridge=57 A 405 grain bullet at 1330 FPS out of a 7.5 pound rifle has 18.7 ft-lbs of recoil energy according to Chuck Hawks(sounds light to me. Dunno where he got those numbers. There's no smokeless load that comes close to 1330 FPS. Unless it's the original BP load.). Compared to a 350 grain at 1900 FPS that has 37.9 out of a 7 pound rifle. The 405 at 1800 FPS will be similar to the lighter bullet. __________________ Spelling and grammar count!