Elric
Well-Known Member
After another night without alcohol to power cogitation (Bender is my hero), I came across the article by Harry M. Pope on his barrels. He used a gain twist. And a taper from breech to muzzle.
Has anyone delved into the mathification of calculating the relationship between alloy, bhn, rifling, pressure, and velocity?
I don't have anything to do with gain twist. No inclination, either...
PS. So, Pope made muzzle loading (using false muzzles), and breech loading barrels. The 200 yard group guarantees he gave in his article were 3 inch for muzzle loading rifles, 2 1/2 for breech loaded rifles. Methinks the slightly larger muzzle loaded groups are due to the taper in the barrel. Larger at the breech, smallest at the muzzle. So if you load the bullet from the muzzle, it will be swaged down to fit the smaller end, and when it reaches the (relatively) wider breech end, it will be a wee bit smaller. But... if the powder is quick, it should smack the base and upset it...
Breech loading would start the bullet off at the wider end, and as the bore tapers, the bullet will "squeeze" down.
Maybe that is why, for tapered bores, the ML is slightly less accurate. For a straight bore, I'd say a ML bullet would be just as accurate as breech loaded...
Has anyone delved into the mathification of calculating the relationship between alloy, bhn, rifling, pressure, and velocity?
I don't have anything to do with gain twist. No inclination, either...
PS. So, Pope made muzzle loading (using false muzzles), and breech loading barrels. The 200 yard group guarantees he gave in his article were 3 inch for muzzle loading rifles, 2 1/2 for breech loaded rifles. Methinks the slightly larger muzzle loaded groups are due to the taper in the barrel. Larger at the breech, smallest at the muzzle. So if you load the bullet from the muzzle, it will be swaged down to fit the smaller end, and when it reaches the (relatively) wider breech end, it will be a wee bit smaller. But... if the powder is quick, it should smack the base and upset it...
Breech loading would start the bullet off at the wider end, and as the bore tapers, the bullet will "squeeze" down.
Maybe that is why, for tapered bores, the ML is slightly less accurate. For a straight bore, I'd say a ML bullet would be just as accurate as breech loaded...