bearing surface measurement

[soldierbilly1]

any easy way to do this?

I've seen some note that the 356402 has more bearing surface than say "xyz." How do we know this, by eyeball or are we recovering spent bullets? etc

just curious

billy boy

PS I got so much into the casting thing that I forgot about shooting in general!!

[captaint]

Generally, just eyeball it. Unless you're talking about a bore rider or something along those lines. Then, we need to get out the measuring devices. enjoy Mike

[Larry Gibson]

It's easy to measure with calipers of you can just eye ball it with a side by side comparison. The length of the bearing surface is generally measured on prefired bullets from where the ogive goes to full caliber back to the base of the bullet where full caliber ends. If the cast bullet has driving bands and/or a GC then the bearing length is from the front of the first driving band of full caliber to the botom edge of the full caliber base or GC.

Larry Gibson

[Mk42gunner]

If you really want to get anal about it, you could roll a boolit across a stamp pad then on paper and measure each band. But I just use the Mk one eyeball.

Robert