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Old 11-14-2012, 9:25 PM
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Calif Mini Calif Mini is offline
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Default Rimfire case rim thickness

Quote:
Originally Posted by Izzy43 View Post
Great shooting, lot of stress in that last shot. What method do you use to measure rim thickness? SK Std+/Wolf MT is also my ammo of choice, best for the $$$ going in my opinion. Keep shooting with us, new targets every month.
I used a little piece of 12L14 bored out to simulate a chamber. (Actually thought of getting a Bentz chamber reamer to make one) and dropped rounds in and used a dial indicator that measure in tenths of a thousandth of an inch.

Found almost .002" spread in 600 rounds. Grouped first box with the shortest rounds and used these to "foul" the barrel and warmup.

Then marking boxes 2 - 2.4, next 2.5 - 3.0, next 3.1 - 3.5 and finally 3.6 plus.
These numbers were only for reference and have no direct height meaning.

CIMG0138.jpg

Originally thought I was going to sort by .0002" but there is a lot of variation when sweeping over the rim with a sensitive indicator so went with .0005".

Last edited by Calif Mini; 11-14-2012 at 9:34 PM..
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