When I used to sell/trade them off to fund the next project, I never kept more than one in a given chambering. I seldom trade them off any more, so have ended up with multiples in same chamberings. Currently, there's multiples laying around in 22 LR, 223, 7x57, 270, 30-06, 300 H&H, 9.3x62, 45-70 and 45 ACP.