Velkommen, 3006 og hilsen fra nord Idaho.

I like Johan's idea.

I do not have experience with the 21 action.

But I had alot of problems with feeding of the 6.5x55 in my CZ550 and I am thinking that a switchbarrel job going between the two calibers you mention would not work well for one of them.

I posted the whole ordeal elsewhere. Eventually, my 6.5 was rebarreled to 9.3x62 and I am VERY happy with it. Feeds perfectly, slick as chocolate chip cookies through a Beagle.