The action isn't rechambered. Buy a rifle, remove whatever barrel comes with it, order a new barrel chambered in 6.5 x 55, and install that on your action. You could get some of your money back by selling the original barrel.
Right! I didn't mean the action. I thought the chamber was attached to the action and the barrel was separate. Now i think the chamber is in the barrel! Is it always in the barrel?
any modern action will do fine at high pressures, right?
A major difference is then the smoothness of the action.
What else makes one action better than another?