The full-size gun was bought new retail in December, has seen about 1,500 rds. Kept pretty clean. The uselessness, even for practice really surprised me, having stored the (blue) 500-rd. 'brick' in its original tights cellophane plastic, inside a sealed ammo can in the air cond. room since purchase about three years ago. About 1/3 of today's 50 rds. wouldn't strip from the mag which came with the nice gun. The other brands tried--Federal Automatch, Am. Eagle, Blazer do pretty well, function about 95% of the time. These (as with my friend's Walther P22) might also be designed for the CCI Minimags, but the "Champion's" advertised muzzle fps. is very similar to this Federal in the blue boxes. As also with the 38 or 40-grain bullets.