I bought my CZ550 in 375H&H mag in November last year. I had a Brno 602 in the same calibre 15 years ago and, without modification, it would shoot MOA off a bench all day with most loads - I was a bit dissapointed with the CZ since I was expecting the same performance. Mind you it does shoot as good as the test target that came with the rifle, but I was hoping that I could improve on that.

I've bedded the action and just behind the recoil lug under the rear sight. I've also floated the barrel forward of the rear sight lug. Unfortunately this hasn't made any difference - maybe I have't done a good job of it but have bedded several other rifles myself in the past with good results.

It will shoot the heavier projectiles (300gn & 350gn) better that the lighter ones (220gn & 270gn) ie 1 to 2.5MOA vs 2 to 4MOA.

I'm still happy with it though and it's a lot of fun. Being a big heavy rifle the recoil is very nmanagable and I can bench shoot it all day.

I shoot the Big Game Rifle Match that we have here in Australia and am now looking at a 458WM or 404 Jeffery. (I'd consider the CZ again but will see if I can find one with a good test target.) I've shot both and the 404 was a bit more comfortable to shoot but is only available in the higher grade (ie more expensive) 550 model (not to mention more expensive brass etc).