When taking serious measurements I put the target on corflute or coroplast. Then measure the exit side. With your finger massage the hole and it will almost close to the hole center. Then it's easy.
Question.... How to measure groups.
- Thread starter NDAR15MAN
- Start date
huh? massaging what?
If they're all going in the same hole, no need to measure.
Like this on the right?
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It's simple. Rotate your finger around the bullet hole will push the flared plastic back down to flat. That closes part of the hole up to not much more than a pinhole. Then it's easier to identify the center.
I went outside to my shed at -20 just for you 911nut. Now you can see a picture. That hole is about 1mm across or .039 inches for you. I hope that helps your lack of imagination.
I went outside to my shed at -20 just for you 911nut. Now you can see a picture. That hole is about 1mm across or .039 inches for you. I hope that helps your lack of imagination.
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It's simple. Rotate your finger around the bullet hole will push the flared plastic back down to flat. That closes part of the hole up to not much more than a pinhole. Then it's easier to identify the center.
I went outside to my shed at -20 just for you 911nut. Now you can see a picture. That hole is about 1mm across or .039 inches for you. I hope that helps your lack of imagination.
Hey Rick,
Yeah I was being a smart ass, sorry.
I wasn’t sure it was serious, I had to look up corflute and coroplast. I didn’t know what that was.
The plastic is used to close the ragged back, I don’t understand the hole in the plastic? Is it a backer? I guess my imagination has faded some.
when I’m trying to get a “good” measurement of a group I first know what the black ring measures for a single shot of the bullet and target paper. Then I’ll push back the little sticky out parts on the backside of the target if there are some on a flat surface. I zero the digital caliper on the single shot black ring and measure the group a few times.
I do a quick measurement of groups to the thousandths cause the caliper can and it gives me numbers to evaluate loads.
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Well I am just saying when measuring bullet holes on paper I find it a bit subjective. My old eyes need a magnifying glass to see measurement in the exact center or the real edge of a bullet hole. Too much room for error times 2. That is 2 shots in the extreme spread. An error in one hole compounds the total error (I'm not OCD, really).
So by pining a target to "old political signage" corflute (cheap after an election, and better if it has the right pictures on it. Oops sorry Chuck S)
Then on the Exit side you will find the bullet hole has almost sealed up. Greatly reducing the guesstament on the front. That pinhole in my picture is an example of the exit side of the corflute.
That just simply aids in zeroing your calipers to a more objective position. I hope I'm clear now.
And ya I took no offense. I had NO intention of creating double meaning in my first comment.
So by pining a target to "old political signage" corflute (cheap after an election, and better if it has the right pictures on it. Oops sorry Chuck S)
Then on the Exit side you will find the bullet hole has almost sealed up. Greatly reducing the guesstament on the front. That pinhole in my picture is an example of the exit side of the corflute.
That just simply aids in zeroing your calipers to a more objective position. I hope I'm clear now.
And ya I took no offense. I had NO intention of creating double meaning in my first comment.
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