Slide Lock - HELP

Catbird,
The same ammo I've been using for the past couple of years - 124 Speer Gold Dot. The same ammo feeds well through my P7 and my Glock 26. Could my extractor be gummed up? Do I need to remove the firing pin assembly and clean out the inside? When I practice shoot it is ususally with Winchester white box 115 gr, the 124 GD is for real work and I usually put at least a mag of that through with each range session.

I spoke too soon - I just went down to my basement and ran a few Gold Dots thru - all got stuck. Then I went to my white box stuff - all smooth as silk! I've got that box labeled now and will try it out with the other weapons, then compare the serial numbers to other boxes I have. Update later.

Thanks to all for their replies. I went through my inventory of ammo and have three variations. The Winchester white box works fine, the Speer Gold Dot 124gr, lot #A15F22 also works well. It is only the GD lot #B09D24 that jams up. I have three boxes and random samples from all three exhibit the same behavior. Based on case color (silver, not brass) and the bullet nose design (six notches, longer taper) I believe these to be second generation. In any case, my other guns feed it ok so I'll just be careful what I load.