Shot with a friend of mine over the weekend, who was using 62 gr FMJBT Arsmcor bullet at 600 yards (I realize it's not an optimum bullet for 600 yards, but this was all he had). His load was 24.4 grains of Varget. The guys in the target pits said that the bullet was not supersonic when it hit the target. Said there was no sonic crack when it came through the target, and every shot of his sounded like a berm shot. But it was still making round holes in the target, no evidence of any keyholing at all.
It took 3 shots to get him on paper, and a couple more to dial-in the correct elevation. On his second string of 10 rounds, he did surprisingly well (shot an 88-1X). Watching the trace, his shots were definitely arcing a bit higher than the others. Can anyone look at the numbers, and tell me if that round should be supersonic at 600? We verified his powder scale with a round that I had, by breaking it down and weighing the powder and the bullet, and it read about .1 gr lower than my scale. Thanks for the help!