I'm certainly not new to firearms; however, I'm just now getting interested in accurate, but non competitive, shooting a bench. In this case, I'm using a Savage MKII FV .22.

Yesterday I shot a surprising 5 shot group with all five rounds in the same hole. This is definitely not my normal group size, that's for sure.

The question is, how to measure the group size, or more to the point, how to measure the size of the resulting hole.

I believe I'm supposed to measure the diameter of the hole minus the diameter of the bullet. I think the 22LR shooters use .223". Correct?

But what size is the hole? The edges are far from distinct, at least to my eye.

The picture shows the calipers set at .332 inches. Would you say that's a fair measurement, too conservative, or too generous?

[IMG]IMG_0031-Edit by Mozella55, on Flickr[/IMG]

Here's the work in progress with the new Boyd Barracuda stock.

[IMG]IMG_0023-Edit by Mozella55, on Flickr[/IMG]