Cool. My Lyman 48th says 2.155. I'd say somewhere in the 2.15-2.155 range should be fine. The couple pieces of multi-fired brass I measured were 2.160-2.162.
If you are only shooting one rifle in that caliber, you can slug the bore and find out exactly what the maximum length the brass can be. Remember to cut the brass back to 0.010" from what you measure.
Slug the brass with round fishing weight and a fired shell from your rifle.
Speer 13 & Hornady 6 both agree on 2.155" as trim to length. Me, I trim to 2.160 & neck size. Been doin' that for years, no problems, long brass life, and very satisfactory accuracy.
The "trim to" length is not a critical dimension, as long as it is consistent and below the chamber dimensions. Pick either of the numbers that have been listed, trim all the cases to that dimension and you are good to go.
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