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Post by GLSHOOTER on Jan 30, 2017 17:07:42 GMT -8
Maybe I'm confused... But if you measure the outside edges of two holes and subtract the diameter of a bullet, or measure the inside edges of two holes and add a bullet's diameter to get the CTC... wouldn't it just be easier to measure the two left edges of the holes, using the example photos shown, to get the CTC without the math? Try it... measure the two same-side edges, then move the calipers over the center of holes. Am I mistaken? Any of the three would work. By doing the bullet tare for zero I get a direct number and I'm not covering up any of the hole and bullet marking. Greg
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Post by chesapeake on Jan 30, 2017 19:51:59 GMT -8
Here's my thinking. I eyeballed centers with a tape and I was within a tenth of the caliper measurements.
Them bullets measure .262 with my calipers and most of the holes are .250 with the biggest going .252.
For example: 2.060 - .251(average hole size)= 1.809 2.060 - .264 (advertised bullet diameter)= 1.796 2.060 - .262 (measured bullet diameter)= 1.798 Inside/outside = 1.84 Tapemeasure = 1.75
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Post by GLSHOOTER on Jan 30, 2017 20:10:02 GMT -8
You have to measure the mark too not just the hole.
Real world is that is super shooting no matter how we measure it.
Greg
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Post by chesapeake on Jan 30, 2017 20:15:55 GMT -8
You have to measure the mark too not just the hole. Greg All measurements are to the outside of the black smudge. There are no visible marks outboard of the smudge. I had no expectation that the smudge would be bullet diameter.
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Post by Deleted on Mar 26, 2017 21:09:23 GMT -8
Damn fine no matter how you "slice" it. Outside to Outside and subtract a cal, Inside to Inside and add a cal, Same edge to same edge.
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