While a bit expensive, the precision mic works very well to do what you're talking about. You shouldn't have any issues, and you don't have to worry about the accuracy of your caliper.rlandry6 wrote:I settled on the RCBS Precision Mic.
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Like everything else here, this will probably come back and bite me in the butt
Just be sure to throw the bullet portion of the mic in the trash. The theory that you can measure bullet jump for your specific bullet with a "generic" bullet is flawed. On top of that the tool itself is a crappy design, and it's impossible to get a consistent measurement. On the positive side it will break quickly, making it much easier to throw away.
Something you may not have considered: The precision mic is sold as being cartridge specific, but the body and case portion are the same across cartridge families. Only the bullet portion (which you throw in the trash) is specific to each cartridge. For instance, the 30-06 mic can be used for 30-06, 25-06, 270 Win, etc.