One gun scribe maybe Layne Simpson said a cartridge had to develop 300 fps more than another to see any difference in the field. Not sure if 300 fps is enough but when I compare my 7RM and 280 AI to anemic factory 270 loads (+/- 2,900 fps) I do think there might be a visible difference.

Between the 280 AI and 7RM I would be dreaming if I thought I could tell a difference in the reaction on game. Maybe if you compared them to really slow factory 280 loads but even then I doubt it. But I have shot a lot more game with the 7RM than the others and the confidence factor is a good thing.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli