IWisconsin,
I think you should stick with one or the other instead of using different kinds of ammo. I would choose Remington if you don't reload, there bullet performance is better eventhough both are good. About you groups, don't clean after every shot, while this is good when breaking barrels in, it is not when trying to shoot tight groups... ever hear of a fouling shot. After cleaning your rifle shoot it once before taking it out in the field or tring to shoot good groups. The bullet grain thing is up to you of course, I would look at a ballistics chart of whatever kind of ammo you are shooting and decide for yourself. I believe the 130 gr. is the most effecient for me. Good luck! I hope I was some help.