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Measuring bullet bearing surface?

 
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  #1  
Old 06-09-2006, 02:47 PM
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Location: Armagh, PA
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Measuring bullet bearing surface?

How is this accomplished? I've heard (read actually) of shooters measuring and sorting bullets according to the bearing surface...and that this makes for a significant improvement in LR accuracy. I have several capable LR rifle that could be tuned up a little better and I'm in the process of having a new LR rig assembled (by the newest member of the 2K club [img]/ubbthreads/images/graemlins/grin.gif[/img])...this would be a good time to see what all is involved in this process, tuned my current gun a little better and see if it is really worth it.

Thanks......Dan
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Old 06-09-2006, 02:52 PM
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Re: Measuring bullet bearing surface?

The poor mans way would be to buy 2 Stoney Point comparators, put one on each blade of your calipers, drop bullet in between, and measure away.
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Old 06-09-2006, 03:07 PM
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Re: Measuring bullet bearing surface?

ok thats how i do it what is the rich mans way then.
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Old 06-09-2006, 03:22 PM
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Re: Measuring bullet bearing surface?

I read somewhere, escapes me where, that there is a tool specifically for that application. For all I know it might cost less than the 2 SPs [img]/ubbthreads/images/graemlins/grin.gif[/img] you might be doing it the rich mans way.
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Old 06-09-2006, 04:14 PM
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Re: Measuring bullet bearing surface?

TRUE poor man, would be to size TWO cases tight, and trim to length. then put a bullet into the case, 1 regular and one backward and measure the length of the cases [img]/ubbthreads/images/graemlins/wink.gif[/img]

Probably too cheap, but what the heck!

edge.
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Old 06-09-2006, 07:00 PM
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Re: Measuring bullet bearing surface?

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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Old 06-10-2006, 06:44 AM
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Re: Measuring bullet bearing surface?

[ QUOTE ]
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.

[/ QUOTE ]
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
UB
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