I want to resize some 308 brass down to 260. I am under the understanding that all I have to do is run the 308 through my 260 sizing die and make sure that its trimmed to length. Is this correct? Or do I have to turn the outside of the necks? Im am not really sure what that entails because I have never turned the necks before.

I tried this once for my son's 260 and on the first loading I had no problems at all. They functioned great. However on the second loading my primer pockets were extremely loose. I have been leery of trying it again. I also tired this by turning 7mm Mag into 264 and the 7mm would lock up my bolt. I ended up just buying the right kind of brass..... (smart huh?) But I have 700 pieces of 308 match brass that I would like to try on again....

Thanks all

Ryan