Re: 260 rem redding die bushing
Fired case necks are .2970"
Loaded case necks are .2945"
Sized case necks are .2935."
After looking at these numbers, I'd be tempted to go down to a .293 bushing, but this setup has been flawless to date... Certainly after doing the math I would recommend that you check your setup thoroughly if you use a .294.
I know that .292 gave me more seating pressure than I like. We might be able to get away with less neck sizing on the Lapua brass because its formulation is so hard. With a .294 bushing I cannot seat a bullet by hand and I cannot move a seated bullet with my fingers. YMMV.
If you told me your necks were .2945, I would recommend either a .293 or .292 if I didn't have real world data.
John