quote:

Originally posted by MacD37:

quote:

Originally posted by Bill73:
Todd,
so did the increase in barrel weight result in increased velocity for the regulating load or decreased velocity?

Bill I understand your question was to Todd, and he did have a real time getting his rifle to shoot properly after mounting the scope.

The reason was the addition of a scope and mounts will not effect the speed of the load you are using.
The reason it changes the point of impact is because the weight of the scope and mounts is above the barrels and depending on the weight of the scope and mounts and how high it is mounted, this tends to retard the natural muzzle FLIP.

When a side by side double rifle is fired the barrel being fired tends to move away from the other barrel and up at a different amount than it did when fired without the weight.

When a properly regulated double rifle with the iron sights pointed at the aiming point on the target, the right barrels line of sight will actually be pointed at a place on the target that is low, and on the left. As the recoil flips the muzzles that barrel will move up and to the right, and when the bullet exits the muzzle it will be pointed at where the sight was pointed when the trigger was pulled, and vice-versa for the left barrel.

When weight is added to the top of the barrel set depending on how heavy the scope and mounts are and how high they are above the barrels the more or less the muzzle flip will be retarded so that the bullets hits the target differently than it did from the barrels without the extra weight. The velocity of the load will not be changed, but the muzzle flip will!

When mounting a scope on a s/s double rifle it should be as light and as low as it can be and still line up with eye, and as strong as it can be to take the punishment of the recoil of the rifle being used!

Todd put in a lot of time, powder and bullets to find a load speed that would overcome the adding of his scope. In his case he found a good load that let him shoot a wart hog right between the eyes at some distance with that rifle!

I'm about to get into the same situation because I now must mount glass sights on all my doubles because of an eye problem.

Good luck Bill!