07-25-2021, 03:40 AM
(This post was last modified: 07-25-2021, 03:41 AM by BassinDmax.)
I'm running an X-Caliber 20" barrel on an AR platform and I'm curious if I may have a shorter then spec freebore. It was cut with PT&G reamer and the drawing shows a freebore of .0899", but I wonder, is it? I'm running my start loads at .020" off jam.What I'm finding is a lot of bullet stuffed in the case. I'm using the Hornady L-n-L Bullet comparator tool with the Short Action Custom inserts to take all my measurements. I'm getting a base to ogive of 1.590" and COAL 2.243" with the Hornady 103 ELD-X, Berger 105 Target is 1.592" and 2.191", Sierra 107 SMK is 1.586" and 2.243" and Berger 108 Target is 1.590" and 2.215". Just seems like I should be able to get more bullet out of the case, but I only have .020" to play with before concern of jamming into the lands. I'm considering having the throat cut a little deeper, I could definitely add more length and still be under mag length. What has your all experience been with seating depth in the 6ARC? Are my findings abnormal or is this normal for seating depth?