Curious to which bullets you had come apart. I want to be sure and stay away from them.
It's been 5-6 years since I sold the rifle. I know that the Winchester 55gr FMJ-cannelured bullets failed routinely, probably due to poor bullet construction. I bought a 500pk of them to load for plinking, so that was irritating. I think I had a problem with Sierra Blitzkings, but I can't recall the weight; probably 50gr. I remember that the 52 and 53gr SMKs worked perfectly. I used those for CMP reduced course. 60gr Hornady VMax also worked well if I needed a varmint bullet. I shoot 1x 9s now since I don't have access to a range over 300yds. I'm not shooting 90gr VLDs, over magazine length loads, or M856 tracer, so I don't need the 1x7.
