I agree with Mike and differ a little with Ray

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I do not have the many years(many, many years!)of big bore experience that Ray has, and find a noticeable recoil increase of the 416 Rigby over the 375 H&H. I can shoot the 375 like a "regular" rifle where with the 416 I have to get into my "big bore mode" and pull it into me more. Load development and bench time is fun with the 375 but is tiresome on the 416. The 375 is a sweetheart!

I recently purchased a Ruger #1 in 458 Lott and found it to be just what you knowledgeable folks said it was. A big step up in power from what I was used to. It is a hoot and I love it but from the bench it can be tough (way above the 416). I don't down load it, just use 500 grainers at 2250-2300 (I have my smaller rifles to shoot if I don't want to get smacked around a bit!).

I really think you need all 3 calibers! Seriously I wouldn't be without a 375. Great rifle that will pretty much do it all and will be a great "entry" biggish bore. If you handload then download the that 458 Lott and work your way up. I love the big bores!

John