K&M Primer Gauge Users

[INTJ]

I have seen @dmoran and @mikecr discuss this tool. I just got mine about an hour ago and have some questions.

I seated a couple BR4s in Lapua 6 BRA cases. The primer pockets are uniformed to the point of just cleaning out the fired primer residue.

.002" crush with the K&M put one primer at .001" from flush and the other measures .002". A third primer seated the old way by feel in was .004".

Questions:

1. Do you still measure depth after seating with the K&M gauge and sort cases by primer seating depth?

2. Best I can tell, my "feel" method was over crushing primers by .002-.003". Is that what you have seen? I assume that is not optimum?

3. My 300 WSM LR BR light gun is tuned to an average of .3 MOA at 200 yds (four 5-shot groups on four different days). It also managed a 1.5" group at 600 when I had the neck tension correct, there was a let up in the storm blowing though, and the barrel was still tight. I got there in part by seating the primers by feel and sorting the seated and weighed Fed 210Ms into groups of .001-.002" and .002" to .003". I have no idea of the crush. My ES have been 8-11 fps. Given the 300 WSM is much less sensitive than the 6 BRA, I don't know if there will be as much of an advantage for the K&M gauge method. What have you guys seen with the 300 WSM and the K&M gauge?

Thanks.

 

[sqrlgtr]

I cant tell you anything on the 300wsm but I use this primer tool and have found it did lower my es,sd (30br)and no I do not sort any after seating.This is the only tool I know of that measures primer and pocket then seats all the primer's the same and after you get use to using it the process is not all that slow,but the most I ever prime at one time is 75 to 100.

 

[mikecr]

The primer pockets are uniformed to the point of just cleaning out the fired primer residue.

Were NEW pockets uniformed to same depth?

.002" crush with the K&M put one primer at .001" from flush and the other measures .002". A third primer seated the old way by feel in was .004".

If pockets are actually same depth then the seated height variance is due to differing primer height as manufactured. This doesn't matter. Your measured crush setting does.

 

[INTJ]

Were NEW pockets uniformed to same depth?

No

If pockets are actually same depth then the seated height variance is due to differing primer height as manufactured. This doesn't matter. Your measured crush setting does.

Thanks!