Redding Neck Bushing size ?

[Drifter]

What size of the Redding neck bushings usually provide the best results (accuracy) in the Grendel chamber?

I'm primarily loading 123gr A-Max and Lapua Scenar bullets in Hornady brass.

Thanks in advance.

[metalman]

Size your bushings according to the procedure in Redding's catalog. Thats the best place to start. Benchresters will usually play with the sizing to make the neck tension more loose, but thats not a good idea in an auto loader. The slamming of the bolt will move the projectile. I keep my neck tension up around .003 to .004.