Well, I didn't see that this problem was posted, but I could have easily missed it. I have a minimag and I'm using the bronze spring, 2 shims, and the carrier with only 1 dot (.5 I think?). I'm having a problem where I get unbeleivable shootdown, after around 4 bps the ball will just roll out of my barrel. I tried switching to the next larger carrier, but when I do I get a slight leak down the powertube for a little bit after I shoot, so I think the carrier I have is the largest one I can really use without having leaking problems. Any ideas? Thanks.
EDIT: I was chronoing around 280 yesterday, when I was having problems.