The new Lee Breech Lock Hand Press. The world's most popular hand press, more convenient than ever, now includes the Breech Lock Quick-Change Die Feature, so you can instantly change dies with just a twist of the wrist. One Breech Lock Quick Change Bushing included.leeprecision.com
Just use this, problem solved.
I’m also looking into reloading 300 Norma on the Dillon 550. Anyone got first hand experience and can confirm what shellplate (if any) works? Thanks.