Re: 7mm Ultra Mag
Hodgdon powder has data online. Hornady has data. reloaders nest.com has data too. stevespages.com too. Retumbo, RL25, Accurate 8700, IMR7828 are all powders that can work in the 7 rum. WC872 and US869 are too. I use a max (my max for my rifle) load of 95.0 gr RL25, fed 215,150 gr partition OAL max for magazine length. Rem 700 LSS factory rifle. 3450 fps and good hunting accuracy. Each gun is different and behave differently. Very important to start low and work up your loads for your rifle.