thanks. i think the little mags may be the issue. I just dont get why its only, let 100% consistent with a certain ammo.
The ammo manufacturers don't care if it works with all guns. When they have a crappy profile, they shorten them, thinking it helps with feeding issues.
Where you need to look next time is where its hanging up on, presumably, on the feed ramp. I'll guess you'll see the shorter round hits the feed ramp at a more perpendicular angle, right on that corner of the round, particularly, at the end of the mag when the spring is at it's lowest applied force. You should be able to repeat this without having to shoot the round.
Go into a place with a safe backdrop, bring only two rounds. Put one in a mag, have the slide held by the slide release lever, insert the mag, release the slide slowly and watch to see where it hangs up. If it doesn't do it when releasing slowly, just drop the slide by releasing the slide lever, again watching how the round slides into (or not) into the barrel.
Yes, as Stan said and I eluded to before, polish the feed ramp as Stan described, I finished mine with a soft cotton "bullet" with red polishing compound on my dremel. Reducing the friction on the ramp will help the round slide up and into the barrel.
I'd also recommend shooting from a rest, at the range where you bought it and see what they say. If you can repeat it from a bench rest, you can eliminate any "user" error.
Just more cents thrown into the kitty...
