I am planning on buying a used 22-250 Rem. SPF from a guy that has ran about 100 rounds threw it. The gun is not very old and in great shape. What I am thinking of doing is rebarreling it to a little faster cartridge. I have 2, 22-250's all ready but with the short action I now there are a bunch of choices I can go with. I would like to be able to shoot 55 grainers at about 3800 to 4000 feet a second. Leaning toward the 22-250 Ackley. But not sure. What is Ya'lls opinion?