Kaboom
Well-Known Member
Loaded up some .308 175 for a 600 F class (my second one) what do you feel is the range where runnout starts to be an issue? I figured .003 and above but that is just an uneducated guess on my part. Thanks in advance!!!!!
Thanks Richard. I'm shooting a stock 700 Varmit gun so I kinda figured .003 as my cut off. Would this be a nonissue if I were to seat into the lands? I'm not but just wondering for future referance.
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
Run out does effect the performance of the shot that is out pass the 400 yard range,. Mine for my 6mmbr 105 gr Bergers have to be .0015 or less to shoot sub moa at 500 plus yards. With my 338edge run out have to be .002 or less to effective shoot past 600 plus yards with 300 gr Berger's.
My seating is at .010 off the lands for both rifles. Only after using Redding comp dies have I been able to keep the run out under control.
Interesting thing I did was to use my Hornady concentricity gauge and adjust the run out to .003-004-005 and .006.
The results were , more the run out the loss of MOA on the target with everything being the same, power and charge, bullet and primer. Also the greater of run out the spread larger and did have a flyer every so offen
For those that want to shoot under long range then I would don't worry about run out.
charlie
I would bet that whatever your Hornady concentricity gauge registers is about half of your true TIR.
i.e. .0015" is probably .003" TIR or greater when measure with a NECO or Sinclair
I have the NECO and Hornady. And, that's been my experience.
-- richard
Richard:
Cann't agree on gauges, as I have also Sinclair and it will be same as or not more than .0001 differance. Reason I use Horandy is to move a bullet if necessary.
Charlie