I loaded 5 308 last tight. Win brass, cci primer, hornady innerlock 150 grain. IMR 4064 43.3 gn. This load shot good, but it is 4 inches lower than factory loads by federal with nosler ballistic tip. My Hornady book says that the loads I made are at 2600 fps. Are my reloads that much slower than the factory that they shoot low? Or is there another reason? Thanks. Wanna kill these ads? We can help!