Ahh, yes..pulling...yes, that one.
Bullet pulling is caused by poor quality ammo manufacturing standards and greatly increased by firing it in flyweight revolvers with very little mass. If you plan on carrying this LCR be very sure of your ammo. The crimp actually has very little to do with holding the bullet in place. Neck tension is what holds it in place (unless you're using a SWC with a deep crimp groove). If you are using jacketed bullets then the neck tension better be tight or no amount of crimp will hold that bullet in place. Personally I would NEVER trust mass produced factory ammo in a flyweight revolver. You could test it by loading one chamber and leaving it in there while firing several cylinders worth and then measuring that one round. Inertia is a powerful thang. Any detectable movement whatsoever makes it a serious risk with a carry gun.