I was just shown a photo of a group shot with a hand loaded 70 grain .22 rounds in a necked down .243 case. The rounds have 2400 at the muzzle and go out at 3600 fps.
The group of four shots was about 1.25" and three shots overlapped, not outstanding until you consider the range was 740 yards!!!
The rifle is used on foxes and basically if you can see it it's dead.
Anyone else have experience of these rounds?.