I recently acquired a Pierce single shot with .264 Obermeyer medium Palma barrel, 28 inches and chambered in 6.5x55 AI. My research indicates nearly identical case capacity as the 6.5-284 with the 6.5x55 fitting comfortably in a short action I should be able to tap the 3k mark with 140 class bullets and some RL26 or H4831SC. The other cool thing is I don't have to be concerned with magazine length, no magazine! It came in a custom F-Class type stock which doesn't fit me at all so I'll sell it, I think it's Bubinga and Hard Rock Maple core. Beautiful stock, just not usable for me. All that to say that there are choices available to create a fast short action 6.5 rifle without losing anything other than factory ammo and in a pinch one could comfortably shoot factory 6.5x55.