New RCBS Rock Chucker owner. I thought I would start with 223 so I bought the RCBS FL resizing die set for 223. I didn't realize the shell holder didn't come with the resizing die and the local store only had Hornady 223 shell holders so I bought the #16 Hornady shell holder. Resized and decapped some brass. Checked my brass in the Lyman MSR ammo checker box and the rear of the brass isn't flush with the checker block. I measured resized LC, Wolf, and PMC brass. I tried unfired factory rounds and they fit flush so it's not the block. I had done the whole 1/4 turn tighter thing when I first installed the FL die. I upped it to a 1/2 turn and it didn't seem to help any. My previous search on mixing shell holders and die mfgs said that the shell holders should fit between manufacturers, but maybe not? Anything I should check before I order and wait a few days for a RCBS shell holder?