rounds do you roll up and keep on hand? Unlike plinking rounds these only see the inside of a magazine a fraction of the time a year. For the last couple years 40 rounds, enough for 2 15 rd mags with arredondo extensions have seemed fine. This year I decided to shoot 'em up and darned if I didn't loose my data. Time to work up all over again, but this time I'm gonna mix in some tests with different primers and maybe some penetration tests.