Quote Originally Posted by tacfoley View Post

The idea is to throw a projectile that will actually shave a little lead ring on being forced into the chamber, this ensuring a good seal. Anything less than that will result in the recoil thrusting the ball/bullet forward and jamming the action.

tac
^^^
This.

A friend of mine tried conicals in his ROA and the bullets worked themselves out of the chamber and jammed the cylinder. He gave up on them in the end and now just uses ball.