I found in my Savage .223 Rem. I had a jump of about 1/8" for the 40 grain BT to touch the lands. It still shot sub .300" 3 shot groups at 100 yards. As long as the throat is tight, the distance may not cause an accuracy problem.
However, in my Ruger .22-250 Rem., I had to lengthen the magazine box by replacing the piece of sheet metal spot welded in it, to allow enough room to feed the longer than spec. cartridges which shot the best in it. But, what can you say......it was a Ruger. lol
