Re: Measuring bullet bearing surface?
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You just need one Stoney Point comparator. It is the measurement from the ogive to the base of the bullet. Base of the bullet on the blade of the caliper and the top of the bullet in the comparator. Overkill unless you are heavy into the benchrest scene with a br or a ppc.
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I could not disagree more with this statement, measureing from the ogive to the base of a bullet tells you absolutely nothing, it would be like me giving you my phone number 226-_ _ _ _ without the numbers at the end it is meaningless.
the 2 Stoney Point comparitors works fairly well and is inexpensive. this is what I use for measureing 107gr SMK's etc. for the .338cal 300gr SMK bullet I shoot past 1 mile you need something more precise so I use a bullet bearing surface comparator that has 2 ground bushings for 338cal and a .001" dial indicator. I have a picture of this somewhere but cant find it right now. I got mine from Bill Shehane at D&B Supply in cramerton NC or David Tubb sells the same thing.
if you are only shooting to 500-600 yards this process may be a waste of time ,if you shoot out to 100yds+ it is something to strongly consider, if you shoot out past 1500yds you are wasting your time if you dont measure bearing surface length IMO
It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.