Sheridan, I don't know what it is about them but I have only gotten 2 rifles to ever shoot those Hornady GMX bullets worth a damn. And as you know I am a HUGE Hornady user. For some odd reason I just have not been able to get good groups out of the things. One of my Bolt action 06's (newer Mauser action build with a Shilen barrel) got a 165gr GMX to group well at around 1" at 150 and my 7mm08 barrel for my TC PH spat them out very respectfully at around 1.5" at 200. All my other rifles that I have tried them in just wouldn't hold a group worth diddly. Tried all kinds of powders and load variations and even primer switches. Granted I never tried their factory ammo though so maybe their formula in their factory loads shoot lights out! Never know.