slugged my mosin for reloading

[arslin]

a) Seat the bullet to the overall length specified for the bullet you are using. You mentioned that you are using the Hornady .3105 bullet. The Hornady manual calls for an overall length of 2.855 and that is the cartridge length that I use. That should put you at or near the cannelure. If not, check your brass length.

b) you do not have to crimp the case at all if you don't want to.

from what i read the factory crimp sets lets the pressure build up more and thus more velocity.

thank you for the information.

[Mustang]

from what i read the factory crimp sets lets the pressure build up more and thus more velocity.

thank you for the information.

I have never read that crimping a bullet leads to more velocity and frankly doubt that.

Some argue that a crimp leads to more uniform "start pressures"--the point at which the bullet leaves the case, but I do not believe that would have a significant effect on muzzle velocity.

Many bench rest and other "accuracy" shooters do not crimp their bullets.

[arslin]

cannelure... new word that is good to know. I wondered what that was called.

[arslin]

I have never read that crimping a bullet leads to more velocity and frankly doubt that.

Some argue that a crimp leads to more uniform "start pressures"--the point at which the bullet leaves the case, but I do not believe that would have a significant effect on muzzle velocity.

Many bench rest and other "accuracy" shooters do not crimp their bullets.

now that I think about it, you are right that is what i read. my bad.