I was burning some rounds today and I remembered that my bushmaster gfla upper gets no love at all these days. Hornady brass and cci mil spec mag primers w a accurate mold 275 gr powder coated then gas checked I shot 50 and 100 yards.
40 gr imr 4198 50 yards 1 inch 5 shot repeatable over and over
40 gr imr 4198 100 yards 2 inch, 1 3/4 inch, 2 1/4 inch groups
I’m getting some residues that are hard to patch out but even then I shot 50 rounds today and the fouling did nothing to deminish the accuracy