I have a question , has anyone ever tested the difference in the federal gm210m (gold metal match) primers vs. the federal 210 (standard) primers? Is there any diff. over a cronograph in sd or es? Has anyone compaired overall accuracy diffrence (in any caliber at any range)? The reason for my question is I have always shot the gm210m primers but I recently made a order with R.W. Hart for some stuff and they donot stock the gm210m primers. I asked why and was told that Bob doesnt feel there is any gain in useing the "match" primers, and that he has always used the "standard". I know Bob has had great sucuess in shooting so Im not questining his opnion. I was also told that Bob toured the federal primer plant and the only diff. in the "match" primer and the "standard" primer was a visuial inspection , that the primers all come off the same line. So I ordered 1000 to see my self, I am hopeing to shoot them this weekend and compaire them aginst the gm210m. I was just wanting some more input. Thanks SEMPER FI