The Firing Line Forums - View Single Post - Would somebody explain about barrel resonance?

MeekAndMild · December 2, 2001, 04:51 PM

Would someone explain about barrel resonance?

I went to the range with a 308 rifle I've had for several years to sight it in with new bullets. Prior to this I've only shot Remington brand 150 gr. bullets in it. It groups about an inch at 100 yards with sandbag rest.

So, figuring bigger is better I sighted in some 165 grain Remington Core-Lokt soft points. They give a nice 3/4 high by 1 wide group...3 inches high and 4.5 inches to the right.

I double checked and the 150 grain bullets I usually shoot at the range were dead center in the gun's usual pattern.

Turning the scopes aiming screws put the gun on center with the 165 grain bullets but now I"ll have to resight it for the 150's at the end of hunting season.

So how can a barrel resonate so much to throw off the aim so much with 15 grains difference? Or is it the speed of the bullets doing it? (No, the crown is not nicked, yes the barrel is free floating and is full weight, not light weight, no it is not a short barreled gun, no I don't rest it on the barrel to shoot.)

December 2, 2001, 04:51 PM	#1
MeekAndMild Senior Member Join Date: August 2, 2001 Posts: 4,988	Would somebody explain about barrel resonance? Would someone explain about barrel resonance? I went to the range with a 308 rifle I've had for several years to sight it in with new bullets. Prior to this I've only shot Remington brand 150 gr. bullets in it. It groups about an inch at 100 yards with sandbag rest. So, figuring bigger is better I sighted in some 165 grain Remington Core-Lokt soft points. They give a nice 3/4 high by 1 wide group...3 inches high and 4.5 inches to the right. I double checked and the 150 grain bullets I usually shoot at the range were dead center in the gun's usual pattern. Turning the scopes aiming screws put the gun on center with the 165 grain bullets but now I"ll have to resight it for the 150's at the end of hunting season. So how can a barrel resonate so much to throw off the aim so much with 15 grains difference? Or is it the speed of the bullets doing it? (No, the crown is not nicked, yes the barrel is free floating and is full weight, not light weight, no it is not a short barreled gun, no I don't rest it on the barrel to shoot.) __________________ In a few years when the dust finally clears and people start counting their change there is a pretty good chance that President Obama may become known as The Great Absquatulator. You heard it first here on TFL.