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Old December 3, 2009, 10:43 AM   #1
Thirties
Senior Member
 
Join Date: April 29, 2001
Location: Where the Red Sox meet the Black Bears
Posts: 561
How to get consitent taper crimp readings in .45auto?

Using a dial caliper, how do you get consistent readings for the taper crimp on, for example, .45auto?

I'm talking about the trouble I have actually taking a reading on a case.

So what I do is eyeball the case to see if I get a straight line reflection of my overhead fluorescent tubes.

For roll crimps, I look for a slight bend in the reflection at the mouth.

Otherwise, I find it nearly impossible to get consistent readings, even on the same case.

Do you guys use the fat part of the caliper, or the knife-edge part? Do you take readings with the case mouth horizontal or vertical?

Please know that I am not having any problem correctly crimping my cases. But I have read here and elsewhere about the importance of a correct crimp. Well, at the numbers thrown around in .45auto, say, .469 up to .472, there is no way one can accurately and consistently measure by hand such a fine range (4 thou) on the very end of a round object. I'm not planning to change my technique, just wondering how you guys take your measurements.

What gives?

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