Any advice would be appreciated. I guess I was spoiled with my Springfield 1911 because it would digest anything, including I think the kitchen sink. I now have two Glocks a Model 21 and a Model 35. My learning curve has been with the Model 21 in .45 ACP. Loads that my Springfield would have handle like the proverbial you know what thru a goose have caused nothing but trouble in my Glock 21. By this I mean failure to lock up, stove piping and failure to feed. The lead bullets I am using are store bought semi wad cutters, 175 grain pushed by 4.3 grains of Bullseye. All rounds are loaded on my Lee 1000 progressive press. Cases have been trimmed to the proper length and I have been experimenting with tapered and a modified roll crimp. I have just bought some Speer 230 grain RNL bullets to improve feeding pushed by 8.0 grains of Blue Dot but still the odd failure to lock up....I have a Lee bulge buster kit on it's way from Midway USA thinking that my problem might be in the unsupported part of the case? A factory round seats into the chamber further than my reloads and with the slide refusing to lock up headspace must be nil, which also might explain the light striker tap on some of the reloads that do fire? I should also mention that the barrel is a Lone Wolf in order that I can push lead thru it. Haven't fooled with the 40 S&W as of yet until I get the .45 ACP figured out.