doublegunshop.com - home Forums General Discussion Classic & Custom Single Barreled Sporting Rifles @ doublegunshop.com A pressure problem or something else?

RecoilRob,
What it shows is that the case is expanding enough to release the bullet, rather than restricting it, thereby driving the pressures up. If the bullet is not restricted from starting to move, a slightly larger bullet will not unduly raise pressures. On the otherhand, if something restricts it, such as case neck/bullet diameter too large for chamber neck or too long case jammed into leade, pressure must rise enough to overcome the resistance before the bullet can move. This results in a higher peak pressure.
Mike