Originally Posted by Kaboom
Thanks guys lots of good food for thought. That kinda confirmed my thought on seating in the lands. I understand it wouldn't cure the problem but might be less sensitive. I guess I should have also given more info on my load and process. bushing neck size to .338, then full lenght bushing size to .333 (no expander ball on either) seated with Forester noncrimp BR seater to 2.98 COL. 43.5 of Varget 210M primers Federal match brass neck turned to .013 wall.
Barnes 175 match burners . Then check for runout on sinclair guage. I weight sort all brass & bullets. If anything throws a flag up here let me know, Thanks
I'm perhaps not be the best to comment. But, .013 seems like a heavy cut for Lapua brass. .015 would clean mine up nicely. I haven't measured Federal lately.
If you're having to step down from ~.341 to .338 then .333, you may be working your brass more than necessary. I assume the two step sizing process is intended to help minimize runout?
You may benefit from less turning, thicker brass, more frequent annealing, or a tighter chamber neck.
Many feel that weight sorting brass is a distant second to measuring case volume. My limited experience is that there is little correlation between the two. But, I haven't concluded if either is worthwhile or which is better. So, I'm going to sort by volume for now.
How do you like the Match Burners? Are they all copper? Do they foul much with long strings? I've had good results with the Berger 175 OTM. But, still too early to say for sure.
...take all that with a grain of salt. Perhaps someone with more competition experience will comment.
Regardless, your actual results should tell you how you're doing.