I’m running the AR mag since I haven’t spent time researching upgrades. I very much dislike it and am all ears if you have a recommendation.
I play it on the safe side with what I deem to be the distance to the lands since I seated my 6cm too far one time and, in the field, I had a bullet lodge in the lands and pull out of the case when ejecting a live round (it was my first load recipe and i got lucky and ended up emptying the powder, loading the empty case, and ejecting it fast and it held the bullet).
I have been using the sharpie method and coloring the bullet, then seating it and checking for marks from the lands. If I see any, then i color and seat a new bullet on a fresh load (to avoid using the same bullet and introducing an unexpected factor from a micro adjustment).
Prominent marks from the lands disappear around .01-.025” prior to me considering it the lands as i’ll keep going until the faintest of marks in the sharpie are gone.
It may be unnecessary but I figure if I’m getting good groups and can avoid another issue then I’m good to go. For the RAG2 22ARC, I probably used 8-10 bullets. Once the lands marks disappeared, I used another two bullets to validate the cutoff again.
A few other roksliders listed finding the lands at 2.233 and 2.238 with 77tmk’s. Sierra lists coal at 2.200 on their load data chart.