Try 100 rounds of something else. I haven't had the best luck with Blazer ammo in my Sig. If it continues, there may be an issue with the magazine. Possible it could have bent.

I am having similar problems with my new P220E. It won't feed most brands of JHP at all, and yes, it is difficult to get down the mags. I would be interested if you are having any problems with defense ammo because I certainly am.

I am calling Sig tomorrow.

Are these the 8 round magazines / 10 Round Magazines or the older 7 round magazines?

What did Sig Say?

don't new magazines have to be "broken in" ?

as a sidenote I just bought some 15 round magazines for my Sig 229 9mm from Mec Gar's website

Loading 45 Auto rounds will wear on your finger or thumb, you just ran out of steam. The more you shoot the easier it will get.

Well the other day i put 100 rounds of Winchester FMJ and 100 of Blazer Brass. I had no problem with putting the ammo into the magizines. My problem must of been just a bad box of Blazer Brass. On the issue of defense ammo, the only brand I've tried is Cor-Bon JHP which once or twice it didn't feed completely but i just hit the back of the slide and the bullet when right into place and the rest worked fine.

I'm using 8 round magazines by the way. Does anyone have any experience with the 10 rounders? Are they worth getting? I'm use to having 13 rounds in my Glock and 8 rounds is begining to seem a little short.