Home Forums Hunting & Shooting Custom Rifles & Wildcats Think I got this loading thing down.

A couple barrels I've been around have done the moly build up then blow out deal. That sucked.

Most worked fine with moly, but not any better than with DBC, which is much easier to deal with.

You may be right. But, typically when your loads are doing this, a slight adjustment in bullet seat depth will solve the problem.

You start by examining the average of your groups shape. If there are 2 together and the 3rd shot out of the group, the OAL is too long for your rifle chamber and you need to seat the bullet deeper.

Seat deeper and repeat until the 3rd bullet comes into the group.

If the groups are large equilateral triangles, the OAL is too short so you do the opposite and seat out until the group shrinks.

Thanks for the remedial lesson. Now here's a recap since you weren't paying attention:

shots one and three land directly on top of each other. shot two is randomly elsewhere on the paper.

cleaning (with no other changes) stopped this occurring for a while. then it began again. seating depth never changed.

now do tell, how seating depth that never changes, somehow works part of the time but not the rest of the time, and it's shot number TWO, not three, that's errant?

Doesn't matter what shot it is in the three shot string that kicks out. What Reloader28 described is a normal occurrence, and the seating depth fix he described often works well.

The accuracy differences could be a result of limited sampling due to shooting 3 shot groups.

But....you said it's had quite a few rounds through it and this is oft repeated, so I suspect it could be a cleaning issue.

I agree with 'Loder's assessment also. You might try shooting a 10-shot group and see how many of those 2nd shots are really fliers.

Sounds a lot like a bedding issue to me.

^That.

You don't have to run all 50 of the bullets down the tube. You could run 5 of the 3 finest and see what that does for you?