Thread: 303 Query

Greetings,
There are differences between the chamber and cartridge shoulder angles on the .303. The chamber shoulder is much steeper. This may be due to the forming of cases with the cordite charge in place. Keeping pressures down a bit and neck sizing will deliver decent case life. This is just due to the .303 being a very old cartridge with looser tolerances and a rear locking action. If you want max loads you just have to accept short case life.
GPM.