so i bought a 5r a while back and have been trying run some down the tube as much as i can but haven't really had the chance. i went back to TN two weeks ago and sighted in with the old man. shot hornady 168 gr. a-max. shot beautifully....today went to cherry creek (don't judge me) ,and shot 168 gr. nosler match and my shot groups opened up considerably? i had 1 box left of the a-max so i shot it thinking maybe it was me but they tightened back up. i was surprised to see such a difference at 100yds. is there any other ammo i should try?