I was using TG with my 180gr reloads for my .40 glock, but at only 4.5gr (I was using that too) I notices quite a bit of the brass was bulging more than I wanted it to. So I switched to a slower burning powder. I went with N340 and the velocity is slightly higher and the brass does not bulge, excellend deal for me I think. Another highly recommended .40 powder is WSF. Low pressure and good velocity. Change your powder, keep it moderate (like you are already doing) and keep shooting. BTW, what kind of brass was that that gave out on you?
NCglocker
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