Very interesting. I haven\’t tried the 135\’s, but both the 124\’s and 147\’s have been flawless in my G4 G17 and G4 G34, both are essentially factory stock, except the G34 has an aftermarket trigger in it. In fact, that has been all my G34 has seen from day one. It may have had a mag or two of factory ammo, but 147\’s is primarily what I\’ve shot through the G34. Its my USPSA Production rig. Neither have had any FTF with the Matchwinners. Shot some last weekend as a matter of fact.

I\’m running 1.140 COAL on the 147\’s, with a small crimp, mainly to reduce the bell.
1.100\” on the 124\’s, similar crimp as the 147\’s. I\’ve run them as short as 1.05\”
Unfortunately, not using the same powder, I\’ve been using Titegroup and HP-38.

Are you running Glock OE mags themselves, or just the followers/springs?
Still hanging up with a clean barrel?

Hope you can get it figured out!