I've got another 2 months left before the stamps come back for the 5.56 can coming.
Moving around the two .30 caliber mounts was needed because I have one coming back any day now.
But that's a neat idea. I've heard the term before but never really gave it much thought as I had no need.
I'll have 3 5.56 guns when done. Might be neat to slug all three and see what we see.
How accurate is that method?