Ok I am all set to start reloading the BIG FIFTY so I go to the store and was going to buy some goex FFG and a sales man I know said Hey I've been looking for you for a few weeks now he gives me a box with about 15 pounds of various powders and more importantly 6 pounds of older but unpoened goex FFFG. I know it is suposed to be a pistol powder but I do not have any. I have just the 50-90 So will I be ok to use the FFFG?