Re: Dangerous game rifle: CZ550 / Winchester M70???
The Winchester Model 70 is a fine rifle. It would be hard to go wrong with one of those.
However, I do own a CZ550 Safari Magnum in .375 H&H. It's magnum action is larger than that of the Winchester, which gives you greater magazine length and greater magazine capacity. The greater magazine length allows me to load my .375 to performance levels that are unreachable in the smaller actions.
The price of the greater ballistic performance and magazine capacity is additional gun weight. Depending on your point of view, you may consider that a negative. Personally, I consider greater gun weight in the larger calibers to be an asset because it tends to reduce recoil and makes for a steadier aim.
Another feature of the CZ that I really like is the factory set trigger. When taking a deliberate shot (as opposed to a quicker snap shot), I find that the set trigger does a lot to improve my accuracy. I can concentrate more on sight alignment and breathing. When I am steady and my sights are on target, I don't have to even think about trigger squeeze. I just think "Fire!" and my bullet is on its way. The set trigger helps a lot to avoid flinching when shooting from the bench.
My two favorite rifles are the CZ 550 series and the Winchester Model 70. Both are well made rifles and a joy to use. In DG calibers, each one offers something a bit different. I think your choice really has to boil down to your personal preferences and how each particular rifle fits you and feels in your hands. I remain convinced that you will know which one is right for you the moment you pick it up.