Tim Singleton
Gold $$ Contributor
This is a method I learned from Tony Boyers book and it works very well. IMO seating depth is the most important thingsgreen3 said:What kind of seating depth teat should I run? It did seem moving back off the lands helped. As far as the canted problem yes its the rest cause its not sitting perfectly flat. Ok I'll keep working at 100yrds an see of I can get some repeatability out of it. I currently have 92rds through the rifle.
One one piece of poster paper or I use old Manila file folders. Start a graph across the top and down the side. Shoot 3 shot groups then confirm with 5
For a 6br and 105amax I would go across with 28.5,29.5 and 30 grains of varget
Down the side .005 .010 .015 .020 off of the jam for that bullet and neck tension
You wouldn't think the same barrel in the example target could shoot that well at one depth and so bad just .003 away.
The goal is to find a seating depth that works across a wide charge of powder. The seating depth can be found in under 50 rounds
This particular barrel was nothing to special. You can see how the top left group was nice but scattered at the higher charges. On down the page scattered out. At .009 it came back into more what I was looking for all three charge weights shot pretty well with the middle and high pretty good. Then at .012 off it scattered again. This barrel bullet neck tension seating depth is .009 off jam