Have you tried leaving them loaded and put away for a week or two? Sometime the springs need to get broken in a bit. This has been true with all my magazines for all my guns. I have 2 bc 25rd mags and they work awesome. Probably 8,000-10,000 ounds through them. Lately I have been using winch M-22's and zero problems for the last 3,000 rounds or so. Never clean 'em, other than a quick blast of air from my compresser and wipe down the steel lips. And they work great with the BC mag loader which is a must have. If you can avoid the hollow point varmint rounds and get the round-nose copper coated stuff I think you will find hang ups and jamming issues will go away.