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Posted: 1/11/2013 8:05:58 AM EDT
Is there something I could add to the inside of the jaws to give ma a better surface to measure my case lengths? I seem to get mixed readings and want to be as precise as possible when trimming cases to the proper length. It seems that with the thickness of the jaws, it is easy to get the case just a little out of square and get a reading that isn't true either short or long
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Punch the primers before measuring the lengths.
Sinclair sells a clamp-on caliper attachment that fully supports the case head and is relieved in the area of the primer so no pre-punching is needed. Link to Sinclair 
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Quoted:
Is there something I could add to the inside of the jaws to give ma a better surface to measure my case lengths? I seem to get mixed readings and want to be as precise as possible when trimming cases to the proper length. It seems that with the thickness of the jaws, it is easy to get the case just a little out of square and get a reading that isn't true either short or long Measure them back in where the jaws are wider. They should be parallel and measure the same as far back as you can use them. If they are not your caliper is out of calibration, bent or at least tweaked some how. |
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Hornady also sells this base that clamps onto your calipers. It is totally flat on the surface where the case sits.
Hornady Lock-N-Load Bullet Comparator Anvil Base http://i811.photobucket.com/albums/zz31/dblazek2010/HornadyCaliperbase_zpsddfc4e97.jpg |
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Don't obsess over achieving identical lengths, it's not practical and it's not necessary.
This is a manufacturing process and it has to be done with an allowance for dimensional tolerances. Your trimmer can easily maintain +/-0.001 inches or just a little more, and that results in an excellent finished length. You thumb is worth 0.0005 inches or more if you jam the caliper jaws hard. |
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You don't need all that fancy stuff. Measuring one flat to another is one purpose the caliper is made for. Like Motor1 said, don't use the very tips to measure,
use the wider area about half an inch back from the tips. When you get the case in there, wiggle it a little. That helps seat it on the jaws giving a more precise measurement. |
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