Measuring Bearing Surface

[DennisH]

What is your preferred method to measure bullet bearing surface?

And how critical is this measurement?

Just looking for opinions, Dennis

 

[tenring]

Very good custom bullets and Bergers are made with close tolerances, so that I no longer measure their bearing surfaces. When I did measure them, I bought a set of two identical caliber Davidson nose pieces from Sinclair, press them tightly together in my caliper and measure the bearing surface, sortlng bullets by length to the thous.

 

[Leaddog]

I don't measure bearing surface anymore. Using the dual comparators on my calipers, there is just too much variance in the pressure ring area of the bullet. Using a base to ogive measurement is much more accurate and gave me the consistency I was looking for. I only shoot Berger's.

 

[johara1]

If you want to shoot long, use one like the Tubb BSC........ jim

 

[savageshooter86]

jim those are not available anymore for purchase are they?

 

[johara1]

Mark King sells them now....... jim

 

[DennisH]

Interesting comments above:

Does anyone weigh their bullets?

Dennis

 

[johnmyers]

The tool that John Hoover makes is very good. Measures base to ogive and also used for meplat trimming.

 

[johara1]

I weigh them after i trim and point,then separate them by bearing surface length. Weight is very close after they are the same length. I don't care who's bullets bullets you check BIB,Spencer,JLK and Berger Bearing surface varies....... jim

 

[savageshooter86]

anyone have JB 30 cal bullet insert I could use for a couple days? :-[ Until I can get mine ordered......


https://www.youtube.com/watch?v=CfGL5A6nPSo

 

[DennisH]

I weigh them after i trim and point,then separate them by bearing surface length. Weight is very close after they are the same length. I don't care who's bullets bullets you check BIB,Spencer,JLK and Berger Bearing surface varies....... jim

John Hoover told me measuring the bearing surface is one of the most important steps.

I believe he also told me he doesn't weigh the bullets, just trim and measure the bearing surface.

Dennis

 

[johara1]

Yep, that's what it boils down to in long range. Trim and point, bearing surface and neck tension and be able to weigh powder to a hundredth. A good barrel helps a lot........ ..jim