An “Ackley Improved” cartridge is identical to the parent cartridge except with reduced body taper and increased shoulder angle. At equal pressures there’s limited gain in performance and increased brass prep because fire forming is required.
An advantage of Ackley improved cartridges is reduced brass trimming.
All told I don’t have any rifles chambered with an Ackley chamber because it’s not worth the extra effort.
No work is done to the action.
Yes, you can shoot factory ammunition from an Ackley chamber. All “proper” Ackley chambers will chamber the parent cartridge ammunition. This will make Ackley brass. You could then reload the brass and it would match your chamber.
A rebarrel will revert back to the parent cartridge or any short action standard bolt face cartridge.
