How do most of you measure group sizes? Measure from center of POA to center of each shot in the group and add them up and divide by number of shots in the group? Or center of holes that are furthest apart?
When using a target like this you can eye ball the group easily because it’s broke into 1” squares. Case in point that’s about a 2 1/8” group so no need to get out any measuring devices unless your buddy is running closer to 2 1/4”. Once I’m on paper l won’t adjust anything until I get a consistent group of 1” max but hopefully and usually 1/2”.Group of 3 or 5 shots, center to center of the farthest hits. If you go by point of aim you are basically measuring how far off your scope is and not the capability of the ammo or your accuracy. If you sight in bullseye and get a tight group, but then switch ammo type and get a tight group two inches higher....
So you're measuring between the two worst shots? Out of a five shot group it seems one shot is usually apart from the rest of the group. Four shots almost touching and one shot > inch away. That worst shot can occur randomly in the sequence of shots.Measure the diameter of one bullet hole (outside edges of the "grease mark". This will vary with paper type and bullet design.
Measure across widest part the group (outside edges of the grease mark), then subtract your individual bullet hole diameter. This will be your "center-to-center" group size, and is the standard way of expressing level of precision.
If you're shooting a .308 and use ".308" to subtract for your outside-to-outside measurement, you're exaggerating the group size and because a .308 bullet doesn't make a .308 hole, your group is larger than you think.
Group size (precision) has nothing to do with how close you are to your aiming point (accuracy).
Haha good point. Just wanted to give an example of my comment.When using a target like this you can eye ball the group easily because it’s broke into 1” squares. Case I point that’s about a 2” group so no need to get out any measuring devices unless your buddy is running closer to 2 1/4”. Once I’m on paper l won’t adjust anything until I get a consistent group of 1” max but hopefully and usually 1/2.
So you're measuring between the two worst shots? Out of a five shot group it seems one shot is usually apart from the rest of the group. Four shots almost touching and one shot > inch away. That worst shot can occur randomly in the sequence of shots.
Yes, "center-to -center between the widest shots" is the correct way to measure a groupSo you're measuring between the two worst shots?
LOL So is it a "5 shot group" or not?Out of a five shot group it seems one shot is usually apart from the rest of the group. Four shots almost touching and one shot > inch away. That worst shot can occur randomly in the sequence of shots.
My Ballistic-X app crashes every time I open it, I’ve never successfully used it. I deleted it just yesterday. My calipers are far better anyway, I just thought the app would be cool, not so much.I used to just do center to center, but it’s much easier and more info now with Ballistic-X. I know some don’t have phones and you do need a known 1” reference somewhere on the target.
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