Thread: Neck turning

Originally Posted by Gibo

Ah Ha!! Mate has one, just need mandrel and expander in 7mm.

And an actual reason to do it, whats your neck clearance in the chamber now ?

To find out Add 1.3 thou to the OD of a fired neck due to spring back of the brass, 1 thou if its annealed, subtract that from the OD of a loaded neck to get your neck clearance in the chamber.

Hunting rifle brass can have 2 to 10 thou clearance without too much bother, target brass can go tighter at 1.5 to 2 thou clearance.

Remember at 2 thou clearance thats only one thou all the way around.

Be very careful neck turning/removing material from the OD of brass as the amount you remove will reduce neck tension by the same amount with standard dies that often only have 4 thou neck tension to begin with.
bushing dies can overcome the effect by going to smaller bushings.

You can create a big inaccurate mess if not fully understood first or necessary