The Firing Line Forums - View Single Post - barrel pressure between different grains of bullets and recoil

Jimro · April 7, 2012, 03:11 PM

Recoil comes in two stages:

1: Internal recoil as the bullet is being pushed out the bore the rifle is being pushed backwards, this can be as much as 1/16th of an inch.

2: "External Recoil" which is the "jet blast" as all that pressurized gas pushes out after the bullet leaves the bore.

This is why a max load under a 140 grain bullet in a 7mm Rem Mag can "feel" more powerful than a sedate 175 gr Bullet at a starting load.

When you add up the mass of the powder and bullet you get the total mass leaving the muzzle and pushing back through the rifle into your shoulder. A drop of 35 grains in bullet weight can be totally wiped out by an increase of 10 grains of powder giving back more felt recoil.

Jimro

April 7, 2012, 03:11 PM	#6
Jimro Senior Member Join Date: October 18, 2006 Posts: 7,097	Recoil comes in two stages: 1: Internal recoil as the bullet is being pushed out the bore the rifle is being pushed backwards, this can be as much as 1/16th of an inch. 2: "External Recoil" which is the "jet blast" as all that pressurized gas pushes out after the bullet leaves the bore. This is why a max load under a 140 grain bullet in a 7mm Rem Mag can "feel" more powerful than a sedate 175 gr Bullet at a starting load. When you add up the mass of the powder and bullet you get the total mass leaving the muzzle and pushing back through the rifle into your shoulder. A drop of 35 grains in bullet weight can be totally wiped out by an increase of 10 grains of powder giving back more felt recoil. Jimro __________________ Machine guns are awesome until you have to carry one.