Didn't know where this belonged. If this is the wrong subforum I'm sorry. Looked at the chart and didn't see one for a 260 listed. Can someone tell me which one I need please?
I just looked for myself and they do leave you kinda lost for 260. If I run into one of the old timers at the range I'll ask them as they know all about this sorta stuff. It's probably like attherange says. Mine has worked great for 7mm08 and 308, but I've never tried it on a 260.
I bought a universal Gunslick model that was less than 20 bucks. It works just fin for my .260, .223, and .308. It has different chamber end attachment so you can make about anything work.