J.
I'll jump in here, just because I like to help other people spend their money!

I own and I am very partial to 450/400 3 inch. A great all around chambering if there is one. 400 grains at 1950 FPS in tropical 55 Cord regulation. It's great fun! Bullets are plentiful and cases are available from Mast Technology who makes B. E. L. L. brass. You can shoot a heck of a lot more than a larger Nitro Express caliber. I like the 3 inch over the 3 1/4 because it was always a Nitro round and accomplishes the same thing with a bit less pressure!

My next suggestion is a double in 9.3X74R. You still get the tapered flanged cartridge I feel is necessary for a double rifle and once again ammo and the fix'ns are readily available! It is very close to the 400/360 NE. It is a great stag/plains game round and legal for dangerous game in most countries.

Now most folks cringe at the thought of a scope on a double rifle, however with a scope the 9.3X74R can reach out accurately past what we consider the usual double rifle iron sight range.

Passing along my usual words of warning to those looking for a used double rifle, Buyer Beware! The road to double rifle heaven is a heavily mined dragon's tooth tank trap. There is no shame in not knowing what to look for. There is no reason not to get the rifle checked out! As someone else on this forum most eloquently stated, "check the bores, all else is fixable!" I'd like to see on the face as well! A quick test for that is to remove the forearm and while holding the rifle by the action in one hand and the barrels in the other, try to twist the barrels back and forth. There should be no movement!

Oh well, I've rambled again! Sorry! Good hunting for your double rifle! When it come right down to it, the rifle you like and can afford and shoot accurately, is the best double rifle of all!