[Reloads and after-market barrels]

Did you check the barrel for a squib?

I can recall one time where I seated a bullet too long for a Glock, and the bullet engaged the lands/grooves of the rifling without fully chambering, and when I racked the slide, it yanked the brass off the bullet, leaving the bullet in the chamber.

Thanks for the reply. There's no squib. The rounds will sometimes chamber, but after a dozen or more shots the slide lacks going into battery by .10" or so. Thanks

[Reloads and after-market barrels]

I have a glock 21 with a bar-sto barrel. I loading Rainier copper plated 200 grain FPs with 10 gr of Accurate #7 at app.1.220 in length and a crimp of app .469-".470". A EGW under sizing die is also being used. After several rounds are fired, my slide rides forward and fails to go into battery. I drop all my rounds in the tube before firing them and they always go in and fall out with out with ease. Crimping has always concerned me, but I'm setting the crimp for the same diameter as the measurment below the flare. Anyone have any ideas?