Originally Posted by JonM
It does happen and it depends on how the gun design in question chambers a round. If it hits the top of the chamber hard it can loosen the crimp over time then the bullet can move forward into the lands by inertia. At that point it can create over pressure and kaboom.
If the OAL gets longer that’s ok because pressure goes down the more empty space is created in the case between the powder and projectile.
When the OAL gets shorter is when you get pressure spikes from compressing the powder or making less space between the powder and projectile......just for clarity.
If the bullet is against the lands you might it may or may not affect the accuracy but that’s it.