.300 wm 208 AMAXs and H1000 loads? Please Help!

[EasternNChunter]

Alright, I have been reloading since January of this year so I am still learning. I would appreciate any help I can get. A buddy of mine who knows his stuff was reloading for my 300 wm Remington Sendero. 75.6 grains of H1000 was working great and now for some reason its not. I am using a chargemaster so I feel pretty sure that the charges are all accurate. I can't remember the exact velocity but I think I was pushing 208 Amaxs 2760 fps. Using Federal Match primers and Winchester brass. Thanks