I know this is an older post but I wanted to chime in. I used to have the same problem. I have a MK7 and it's about 20 years old. I bought it brand new. I shoot 240gr FP with 24G of H-110. Almost 1 or 2 out of every mag would not let the slide close all the way. I would just have to bump the slide and it would fire np. I bought a Lee factory crimp die and have never had the problem again. It's been about 500 rounds and not one jam. Might look into your crimp and see if that takes care of it. Good shooting.
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