Best Way to remove the dreaded donut?

[chomondely3]

Yes, jump to the lands. Not sure of the amount of the jump. I let the target talk to me as to the correct jump.

 

[jackieschmidt]

If you are trying to remove the do-nut with inside/outside neck turning, or reaming inside to get rid of it, it will re-appear after several firing/resizing cycles. Maybe not as prominent, but you will feel it when seating the bullets if the straight part of the shank goes past it.

This might not be a consideration for most, but the Long Range Shooting community talk about seating pressure as a huge factor in down range paerformsnce.

But that is in dedicated target rifles, which has evolved into choosing the correct freebore in the chamber to match the bullet you have chosen With much consideration given to keeping the full diameter of the bullet shank well above the neck/shoulder junction.

 

[Rich S]

I’ve had success getting rid of doughnuts by turning the necks on a lathe using a mandrel with 0.003 interference. I skimmed the necks and had a light cut down into the shoulder.

 

[chomondely3]

Good thoughts for future barrels. It will be interesting to see that when I need to move the seating depth out to maintain the same amount of jump if that will get me above the dreaded donut. Of course, I could just use new brass. The Lapua case life has been fabulous so far.