I have a 284 Win in a ULA Model 20. 55 grains of IMR 4350 and a 140 grain Nosler Partition (I get 3000 fps) has killed many sheep, elk, caribou, and mountain goats out to 500 yards. I got a Kimber Mountain Ascent in 280 Ackley about a year or so ago. After playing around with loads I use 62 grains of H4831 SC and a 140 grain Barnes Triple Shock (I get about 3150 fps). I have used this bullet in many other rifles with good success, only shot an animalope with it this year. The 280 AI is 7 Mag performance for sure hotter than the 284 but in reality the 284 will probably due whatever the 280 Ackley will do in a hunting situation. The 284 Win loaded like I load mine will give you 280 Remington performance. Both fun cartridges. Anyways they are both pretty damn good.

Last edited by sheephunter2; 11/20/13.