I have a 280 AI with 25" barrel and a 7RM with a 23" barrel and they shoot almost exactly the same so far. Main difference is the noise level. The first time I took a shot with the 280 Imp. at a Deer I though I had mistakenly loaded a fire form round, the report was so mild in comparison. The longer barrel and a counter sunk beveled muzzle help. Between these two you have to go to 175 grains to see a difference.

"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