I'm starting to have more problems with my DTZ after 500 rounds. I'm getting more FTEs (mostly stovepipes) and occasional FTFs where the cartridge isn't loaded all the way and the bolt is half open. If I pull the bolt back, the original cartridge remains half loaded so if i release the bolt it will try to double feed. Extractor is not missing and I haven't had any OOB firing (yet).

I've been using Federal 525 primarily, but try more Winchester to see if that makes a diff. Loading the magazines doesn't seem to be an issue (cartridges are staggered fine) but I did get a new magazine and some magazines seem to run through fine so next time I'll see if it's related to that. I also don't recall cleaning the feed ramp before so I've given that a good cleaning and will see how it goes.