Re: .260 die set....
I reload for a 260 and I recently sold off all my Redding dies(all calibers, 4 sets in all)and replaced them with Forster. I notice no difference in the ammo produced by either one, but I prefer Forster. I like Forster's micrometer seater better than Redding due to being able to be zero'd, if that means anything to you.
Concerning Berger bullets, my Redding standard die set for 260 left a slight ring around the nose of VLD's during seating that my new Forster dies do not. No difference in accuracy was observed with the ring however.