So I made the same mistake--backwards.
Good thing--the 1991 is now worth ~$1500 due to custom work.
My eyesight is getting really bad. Both boxes of ammo looked the same in the dim light and a couple rounds had rolled out of the .45 box. Yeah; I should not have had them both on the bench at the same time. My bad.
I shot good with the .45; good with my .22 ruger; AWFUL with the sig. My eyeballs just are now having trouble with the white-dot sights. G**d getting old is rotten.
--Boris, both guns intact; some targets left in range trash can!
I once caught myself stuffing a .357 SIG round into a BHP .40 mag. Apparently I'd stuck it in the wrong box while cleaning up, the last time I went shooting.