Exactly what FiremanJG said. I've put a lot of rounds through my Ruger Precision in 6.5 CM using H4350 and 140 A-maxes. Pet loads are hard to define, as lot to lot variation in powder can vary substantially. The lot I'm running now is really slow for example. Stay within the parameters Fireman gave you, and you'll have no problem finding a load that shoots. Another consideration in this particular rifle is case OAL if you're running the supplied Pmags. You'll be limited to a COAL of around 2.800", which could have bearing on your bullet selection. Berger VLD's for example typically like to be loaded close to the lands, but I've had some success at the 2.800 length in my rifle. YMMV. I've been thoroughly impressed with this rifle for price, and there's not much I feed it that won't shoot.