loose powder is the way to go for the best accuracy. He said that loose powder will give you a better consistent burn and better accuracy.
Again, groundhog seems to have had the same results I have had. I shoot a CVA Elkhorn Pro and was having accuracy problems. I talked to the guys at Precision Rifle since I shoot their Extreme Elite bullet. They told be to go from a 300 gr bullet to a 260 grain for 1:28 twist, be sure to shoot loose powder and back the charge down. I am down to 75 grains of Tripple 7, my groups tightened up and I am dead on at 150. I shot a nice 3 x 4 mule deer this year at 140 and was real happy with the bullet performance and penetration.
Gadwall