Minimum COAL

[Stein]

My max mag length is already .2 ish from the lands, so I just wanted to find the first shorter length that gave me good groups.

I did a bunch of experiments and can now load to 1 thou accuracy in seating depth reliably.

It only took me 5-6 depths to find it.  I’m sure there are better depths if i went further, but .36 moa is plenty good and likely the best I can shoot.


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[TheArmoredShop]

Stein - 0.003 is a pretty small increment to work with, let alone maintain on a reliable/repeatable basis.  I suggest working with a minimal increment of 0.010 when testing seating depth sensitivity. 

I can hit .003” increments all day long with Redding competition seating dies with the micrometer adjustment dial. That’s why they are so expensive. .003 can make a difference

[Stein]

Yeah, it took me a bit, but getting +-.001 is fairly easy now and repeatable.  The bullet variation is the biggest factor now.

I found there were fairly big differences in grouping changing the depth by .003 jumps.  I think if you go .01 or .015 jumps you would miss some nice groups, plus I didn't want to go any shorter than I needed to as I'm already jumping a bunch due to the magazine limitation.