Originally Posted by Izzy43
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.
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".