I'm intrigued by that cartridge. It seems to be the most affordable "monster magnum". The thing is I already have a plain old .300 win mag and a very tight budget so no RUM for me, although as a relatively new reloader I have had zero luck with getting .300 win mag brass, but whenever i go to cabelas or anywhere like that there's tons of .300 RUM brass in stock, so maybe its not such an impractical idea (would never pay for factory ammo in that chamberings though). Only thing is its remington brass which in my very limited experience has been disappointing (neck splits). When you consider how much everything associated with enjoying your rifle costs, do you feel that the satisfaction derived justifies the cost? I am seriously considering getting one of these someday down the road. Sorry I can't help with the load data search.