Thread: .303 loads

Bought new Redding dies. Bought new Redding shell holder. Using HPX brass [used] but annealed. The brass had a significant hump around the shoulder area. Sized initially by 1/4 turn in. Mate tried to chamber but no way. Went home and tried various sizing thru the die. Took home a commercial PPU loaded round. A comparison showed the sized brass had a much much smaller shoulder than the commerical round . Yet to attempt a further chambering. What step has been missed to have such a significant difference to the commercial round. Doing something wrong?

Your 1/4 turn in has me puzzled possible you not hard down enough to bring fat brass back to spec.