I rechambered my old 6.5 twist 22 dasher to a 22-243 ackley. I cut of the threaded section so it shortened the barrel to 26.5 inches and got into some new rifleing. So far fire forming max load is 50 grains of ramshot magnum at 3000 FPS. Full tilt very very max load is 53.0 at 3250 FPS. I think the max FPS in this 26.5 inch barrel is around 3175. I pretty happy with speed im getting in this short barrel. The 22-243 ackley really accels in 30 inch tubes. Im just testing it know trying to get it ready for deer season. Just figured some one might like to know. I keep you up dated with the progress.