velocette
Member
Gentlemen;
I have read some accounts about gas operated semi auto rifle accuracy stating that the bolt is moving before the bullet has exited the barrel of the rifle.
Now this sounds a bit far fetched to my practical mind.
Consider:
1, The barrel on my LR 308 is 18" long, the gas block / port is 9" from the muzzle.
2, At the point of the gas port the bullet will be travelling at least 2000 fps or 24000 inches per second. (still acceleration toward the muzzle)
3, The bullet will leave the muzzle in not more than 0.000375 seconds.
4, So, the bled off gas must travel through the gas tube, enter the bolt & build to sufficient pressure to start it moving in LESS than 0.000375 seconds.
5, IMHO, not bloody likely.
Is my math wrong? Or is the idea that the bolt is moving before the bullet leaves the barrel a myth?
Roger
I have read some accounts about gas operated semi auto rifle accuracy stating that the bolt is moving before the bullet has exited the barrel of the rifle.
Now this sounds a bit far fetched to my practical mind.
Consider:
1, The barrel on my LR 308 is 18" long, the gas block / port is 9" from the muzzle.
2, At the point of the gas port the bullet will be travelling at least 2000 fps or 24000 inches per second. (still acceleration toward the muzzle)
3, The bullet will leave the muzzle in not more than 0.000375 seconds.
4, So, the bled off gas must travel through the gas tube, enter the bolt & build to sufficient pressure to start it moving in LESS than 0.000375 seconds.
5, IMHO, not bloody likely.
Is my math wrong? Or is the idea that the bolt is moving before the bullet leaves the barrel a myth?
Roger