Home Forums Hunting & Shooting Ask The Gunwriters Pressure signs.

This explains why the primer pocket grows faster than the OD of the brass. It does not matter how hard the brass is.

The same thing is true of the chamber of a firearm, except that we take care to keep the steel within its elastic limit. The inside of your chamber experiences higher strain and expands more than the outside of the chamber. The thicker your barrel, the greater the inside strain.