I am wondering why no one has mentioned BLC(2)? I am currently using 47.6 gr with the same Hornady bullet, (R-P brass, Wolf LG rifle primers), in both my H&K SPG-1 and my IMBEL FAL and have no function or accuracy problems. I generally get .75" or under 10 shot groups at 200 yds, (the limit at my local range).