I have a very accurate .223 that would average a 5 shot group at 100 yard at about 1/3". Took it prairie dog hunting a couple of years ago and after I got back, went to the range and about all I can get is 3/4" with same exact load. I've tried grouping this gun several times over the last couple of years with the same result. I did'nt run any more than 40-50 rounds between cleaning and I never let the barrel get real hot. I have checked the bullets relationship with the lands and it has not changed during this time. I even loaded some fresh rounds in Lapua brass that I hold back for accuracy purposes and still only get about 3/4". Now I'm thinking that the barrel just lost it's edge so on a whim, I loaded some 40 gr. bullets with same powder that I normally use and sent 5 down range and was astonished that 4 went through the exact same hole and one just touching. Thinking a fluke, I loaded 5 more and shot them and while it was'nt quite as good, it was as around 1/3". I have repeated this a couple more times. Sorry for being so long winded but I have been meaning to post this for along time as it has been bugging me. Sooooo, what happen to my original load? Thanks, John D.