Quote Originally Posted by jdvoracek View Post
Thanks for the COAL data point, bearcatrp: just got around to measuring COAL on my new Model 12 LRP 6.5 Creedmoor using Sierra Match King 142 today at 2.851 - very similar to your results. This bullet is not supposed to be too sensitive to seating depth so I plan to load IMR 4451 at 2.820 cartridge overall length to start. Will post results in a few weeks if it ever stops raining in Texas.
Are you measuring right to the tip,or to the ogive? The ogive is where you want to measure from. Not every bullet is identical so the most important variable for consistent point of impact when it comes to seating the projectile is at what point the ogive engages the lands. So if you're measuring to the tip but it's not consistent with the test loads your point of impact won't be consistent so when possible always measure to the ogive since that's what will engage the rifling.
Just a thought.