I used it for my wife in 270. The recoil is really reduced. I'd say it shot with around 243 recoil, maybe even less.
However, she took a buck with a perfect shot right through the boiler room at 80 yards. He piled up within about 90 yards, but not but a drop of blood until where he dropped. Looked like the bullet didn't really expand at all, little hole in and out. Not sure if it was just a bad experience, but never tried them on another deer after that.
The box has the trajectory difference on it. Inside it's effective range of 200 yards (270Win), it's not that far out at all.