All good suggestions and I too (looking back) should have gone the 7-08 route, live and learn,
But maybe I can help with the seater, what I did is order up a Forster Br seating die with the sliding collar, this collar isn't hardened but just regular machinable stainless I had the Smith Chamber it with the same reamer he used on the barrel and bingo there's your seater. He charged me a few bucks to set it up in the lathe but thats fine wouldn't want him doing it for free.
Great Caliber Choice you'll have lots of fun.
260 Seater 
