You might want to check out 65grendel.com
Bill has put up a good downloadable reloading chart.
Mine is set up with the 19.5" brl and makes for a very efficient [for a 30grain capacity case] and lightweight package. Can go to 1K but it is not meant to be a 260!
Heed the warnings about adhering to Bill's published reloading data and you should have no problems with finding a superbly accurate load. Mine likes the Lapua 123 scenars!