I put about 200-250 rounds through my new MP .40 and had one failure to feed with the last round of a mag, which happened to be an old hydrashok. I thought, oh brother, this gun won't run dirty for long. But I then fired another full mag of 15 hydrashoks and had no problem at all. I can't help thinking it may have been something I did. I wasn't holding it as firmly for on thing. 'Cause I had no problems firing another mag of Hornady TAP rounds. Looking at the hydrashok, it was a tad warped at the hollopoint end, which may have contributed to the problem. The Winchester white box, Hornady TAP, Winchester hollopoints and gold dots had no problems. I tend not to get too hung up on how many rounds fired through a gun before carrying it. I usually fire no less than 200-250, but even if you fire 1000, if the gun fails on round #1,001 is it now no longer reliable? Malfunctions can happen for a number of reasons, many of them operator-involved. But, it depends on everyone's comfort level. A friend of mine has fired over 1200 rounds through his MP .40 and still hasn't cleaned it.