I lose my brass before I need to toss it. I have loaded more 10mm for the 20 than I can even guess. The only time I was bulging brass was with loads that were way over max. I ditched my heavy springs and aftermarket barrels years ago after lots of testing myself. The stock 20 is more than capable of handling the cartridge. I have owned 3 gen 3, 2 gen 4 and most recently a model 40. For the 200 grn weight in particular I use 10.5grns blue dot. It gives about 1170fps out of the 20 and 1450 out of my TNW.



























