Brass trimming

[RetiredArmy]

Just checked my 6 mm br norma chamber with a sinclair chamber length gage. 5 out of 5 checked at 1.593. I have 200 rounds fired on 100 pieces of lapua brass trimmed by the book at 1.550.
Shot my first .1 in group (.166) this past weekend. My question is should i continue trimming by the book, or let brass grow some and trim less often. If so how long would you let it get based on my chamber?
Thanks Bill

 

[#40Fan]

My plan when the new barrel arrives is to trim to .020" under and let it grow until .010" before trimming again.

But, if I were getting groups like that, I'd second guess that decision,.

 

[retired]

is this a factory chamber, that seem mighty long.

 

[RetiredArmy]

is this a factory chamber, that seem mighty long.

Yes, Shilen select match.
Thanks Bill

 

[retired]

sorry, but that is jsut a very rude neck length if your numbers ar correct( they make 2 diff 6mm slugs on for factory and one for neck turned 6ppc)
pick a number and trin there just to be uniform
1.560

Yes, Shilen select match.
Thanks Bill