Everyone has a recoil threshold, and it sounds like the 375 H&H represents yours.

Here's what I'd do:

Sell your Ruger 416 Rigby and put that money into reserve for a safari. I'd also forget about a double and save the money your spend on another rifle for that safari.

What I would also do is develop a good set of premium-bullet 300 gr. loads (solids & softs) for your Ruger 375 H&H that hit in the same place. Then, if you haven't done so already, I'd replace that brick-hard, thin pad on your 375 with a good 1" Pachmayr Decelerator, plus I'd have some expert gunsmith tune, slick-up, and adjust the feeding on your 375 so that it's absolutely perfect.

I'd also adjust the open sights on your 375 to hit dead-on at 100 yds. (front sight blades of different heights are available from New England Custom guns for the Ruger Magnum), so in case of a scope malfunction or a fall, you can remove the scope and still be in business. There are good detachable ring sets available for the Ruger, and an extra, pre-zeroed scope in it's own set of rings is never a bad investment, and that's what I have for my own 375 H&H.

So I'd invest in a rifle you already have and that you can shoot, and I'd forget about another rifle. You don't need another one. I think that bolt-guns are far more versatile and effective for most hunters than a double anyway, and I always use bolt-action rifles for all of my hunting, including African dangerous game hunting, and i've never felt handicapped or under-equipped in any way.

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