Thanks all for the responses. I'm really leaning toward the CZ 455 with a heavy .22 LR barrel
I have the 453 with heavy barrel. I love the rifle but if I was choosing again, I would go with a lighter barrel. Why? Well it makes the rifles a bit heavy, heavier than it needs to be. Also, whilst I can see the advatage of heavy barreled centrefire rifles, I seldom manage to get my rimfire warm, let along hot enough that I would worry about shifting the POI. But if you like a heavy rifle, then the bull barrel is the way to go