I love the 270 AI. I have other AI's but Having been a 270 fan for many years I just ordered a reamer and started to change some of my 270's to 270AI. There is more difference between barrels than one would think but a 24 is about minimum. The only 28" I built did not show a real gain over the 26". Now I have 5 pre-64 M-70's that have been on many culling trips to Africa and the performance is just great. You need to like reloading and shooting but the effort is worth it. I did kill my last two sheep, a Rocky Mt. and a Desert with the 270 AI and every thing was great. I think the 270AI has accounted for many hundred African animals from small antelope to eland and seems to do well esp with the A-frome and triple shock 140's. Will be leaving for africa again in May for culling in two countries. jm