Success

[gunners]

Shot my very first 1 holer group today overall outside measurement is .405 inches - .224 caliber = .181 is that the correct way to measure it :D . First group of the day as well. Same loads next group shot a .375 @100 METERS.
powder was benchmark 2, Hornady 50gr V-max bullets so it's a hunting load as well.

 

[gunners]

some pictures the bottom one allways rotates for some reason

 

[Jimbo357mag]

Group size is measured from center to center, I think. :D :D

...Jimbo

 

[gunners]

thats why I think you minus the caliber off the overall size to give you center to center. for other groups it's easy you just measure the inner most edge to the outer most edge of the furtherest shots but you can't accurately do that with 1 hole.

 

[powder smoke]

Group size is measured from center to center, I think. :D :D

...Jimbo

I think your right. ps

 

[nvbirdman]

gunners measured it correctly.
You can't measure center to center because you cannot determine the exact middle of the hole, so you measure the outside and subtract the diameter of the bullet.

 

[Jimbo357mag]

gunners measured it correctly.
You can't measure center to center because you cannot determine the exact middle of the hole, so you measure the outside and subtract the diameter of the bullet.

aaaaaaaaaaaah yes, Tricks of the trade. I guess if I ever shot a one hole group I might have learned that technique. I do know about the outside edge to the inside edge for holes that are some distance apart. Thanks for the info. ....and great shooting gunners. :D :D

...Jimbo

 

[Rick Courtright]

thats why I think you minus the caliber off the overall size to give you center to center. for other groups it's easy you just measure the inner most edge to the outer most edge of the furtherest shots but you can't accurately do that with 1 hole.

Hi,

The way I was taught was to always use outside measurements, minus the caliber (actually, bullet diameter), to get "center to center." That way you don't get confused on when to use outside, when to use inside measurements.

Nice groups, too!

Rick C