I would reccomend checking www.reloadersnest.com
as a place to find some info. A load We've used in a Sendero 300 Win Mag was 75g. Reloader 22, Federal 215 primer, 190g. Berger, Norma brass. WE got a little over 2900fps and good accuracy. This load worked for us and was safe, but please reduce loads for safety by at least 5g. before working up.