The world record for a ten-shot group at 1000 yards was 4.2 inches in 2003. What I find most remarkable about the accomplishment was that Kyle Brown set the record with a 6 mm BR rifle. Although made from a special parent case, the 6 mm BR has the appearance of a 308 Win shortened to 1.5 inches and necked down. The whole loaded cartridge would drop into a 50 BMG case and rattle around like loose change in a coffee can. Take care, Tom