I use the 245gr T/C express mags in a CVA eclipse 50cal. , loose 777 using 80 grains. The breech plug is recessed. I just had it at the range over the w/end and took 7-10 shots without doing anything other than reloading. Not one problem or sprawling bullets. This is a $100 ML. I 've seen guys on here with $200 - $400 ML's complain to no end. Guess I'll consider myself lucky !