I have this rifle now for close to ten years. Federal, Winchester,CCI and Hornaday have all been tried. The Federal ammo in FMJ performs the closest to the Remington. But you can't find that any more either. I realize that they are all manufactured by the same outfit. But they must be loaded to different specs because the POI of the Remington is an inch or more higher than the others. I also understand that there could be variations from lot to lot.
What I have seen is that even when the Remington ammo was used 3 other rifles the scopes had to be adjusted down when using Remington ammo. I don't believe the lot number had much to do with it because the 2 occasions that it happened were on hunting trips that were several years apart, and ammo was purchased several times from different places.The rifles were CZ, Anshutz, Marlin and Savage.
This leads me to believe that the Remington is loader hotter than the others. And no, I've never run them over a chronograph. Sorta thought what's the use, can't really change nothing, so I just never did it.