you cannot use bullets of 68gr. weight. just to heavy and won't stabilize in the rifling. use only bullets of 40 or 45 gr weight. the original ammo made by remington used a 40gr bullet that was .222 diameter. either use that diameter or .223. i would stay away from all .224 diameter bullets in this cartridge, although there are some who use the lighter weight ones and say they work.if you don't already have loading manuals,please get at least two and read them carefully and fully understand all the procedures before trying to reload this cartridge. as for your powder you asked about, it must be a european number. for faster loads try 2400 or 4227. for light loads, i use hs-6 at the starting load level.