bavarianbrit,
I'm confused, I use an old Rockchucker press and have no problem with .323 or .321" with my setup. Instead of the press, the problem must be the die. You should need only about 3/8" highly polished of the size necessary to give a .318" result (because of "spring back" you may have to start a little smaller, size and measure a bullet, if it is too small polish the die more and try again until you get the size you want), and bore the rest of the die larger than .323"(I suggest 1/2"). If you can find .321" bullets you might not need to size them to .318". If a .321"(or .321"for that matter) will easily enter the mouth of a case fired in your rifle (and not resized) it can be used as is, in those cases. If you change case type, you should test the new cases. If the throat is large enough to allow the neck to expand and release the bullet, excessive pressure should not result. The bullet will be the diameter of the grooves once it has traveled the length of the straight shank of the bullet into the rifling. During this time the pressure is building and as the bullet moves the volume available for the gases increases. On the other hand, if the neck does not release the bullet, the pressure will build until something gives away to release it.
Mike
