ROLY: If the rifle is an all original Churchill et.al., barrel to action, metalwork to stock, I would not consider rebarreling to .220 Swift or any caliber, under any circumstances! Just as long as someone didn't use an orphaned Churchill barrel on a run of the mill Springfield action you're fine! The rifle is as valuable as it will ever be now, [maybe a proper reblue] and mucking it up by rebarreling it will drop the value through the floor. There are plenty of PARKER HALES, F.N.'S etc. in THE LAND DOWN UNDER that you can get to build a .220 but don't mess with this one, you probably have a jewel here and got it at a certifiable steal! Congratulations and Best Wishes Jerry