Eldequello gave good advice. I personally have loaded for several 7 Mags and none of them shot the same loads with equal accuracy. Guns are individuals unto themselves, and just like people, have different tastes As stated before, get some older reloading manuals if you can, and try locating different powders. I have used 4350 with some success in the past, and it is currently available also. It is very important to know and be able to interpret signs of excessive pressure as you develop your loads.