I wouldn't say the 6.5-284 has an edge at all, even in a long action. These are my results with savage rifles that I have built. One 260AI built on a short action and one on a long with the 6.5-284 being built on a long as well. I have had both cartridges in all three guns up and over 3000 fps during load development and backed off to where they shot the best. All guns are using the same 140gr berger and 26" match grade tubes. Its about as close to an apples to apples comparison as one can get.