I was at the range yesterday and shot a Rem. model 788 in .243 that my kids use for pronghorn and deer. I was trying out some Factory Federal premium 100 gr. noslers. The gun hadn't been fired in a year and the first shot was a little low and right of where I expected. The next three were a cloverleaf about 3" high of the target center. I measured the group between the farthest edges(as I usually do) and it was 1/2 in. Then it struck me that I have read some people measure a group center to center of the bullet holes which are farthest apart. That makes this 100 meter group 5/16 in.

How do you usually measure your groups?

Robin