I took my brand new SP5K out to the range today and it did not feed properly after the first shot. I ended up firing about 30 rounds through it one at a time after clearing it each time. I used Remington UMC 115 FMJ. I have read the posts that say UMC is too weak and that you need to run P+ through it to "break it in", but the fact that it didn't seem to come close to feeding properly the whole time, makes me think just using a slightly beefier charge isn't going to do it. The rounds fit really tight in the mag. Is that normal? I have trouble pushing the rounds out with my thumb. That seems odd, but if it isn't even ejecting the cartridge, I don't think that is it. I will go pick up some hot rounds and try it again next weekend I suppose. This was highly disappointing. I was so excited to try it out today. I never had to worry about what type of ammo to use on my Taurus. In fact, I have never had a malfunction on it in years with all sorts of ammo. Please let me know if you have any suggestions.