I happen to own a .416 Taylor. It was a custom build on an engraved Parker Hale receiver, a bit of a heavy barrel, a #3 contour I believe. It has a standard Mauser style trigger and safety, a ramp type peep sight for the rear, and an ivory bead front sight. It's drilled and tapped for a scope, and has a standard Mauser cocking sleeve safety. It's on a OD green Hogue over molded stock, and the whole rifle has been hot salt blued and beautifully polished, I've put 6 rounds through it and it reminds me of shooting a muzzleloader, more of a push than heavy recoil. Really a nice piece of work. I wish I had a use for it, but it sits in my safe. Oh well, maybe I'll just sell it. But, as far as action? Mauser all the way, as far as barrel? Go a bit heavy, then no need for a muzzle brake, it pushes more than kicks. Make sure you get the magnum bolt, and as far as reloading:
You can: neck up a .338 Win Mag OR
You can neck down a .458 Win Mag OR
You can get loaded rounds from Double Tap or get .416 Taylor brass from Jamison. That's the rifle, and the .416 is on the left next to a .300 Wby Mag.
If the price is right and it fits you well that is great. It should do the job quite well.
The biggest potential problem is that if you are traveling and your ammo gets lost en route, you probably won't find any until you get home. I seem to have bad luck with airlines losing stuff, so I probably overrate common ammo as to how important it is.
I have found through my life that father in laws have much less longevity than my rifles so I would take that out of the equation. The Taylor is a fine round, but as noted, it is an expensive club when they lose your ammo. Great idea of reaming it to the Ruger as that may be more readily available. I have several rifles in basturd chamberings that I adore, but unless I could have my PH secure an ample supply of ammo to out smart Mr. Murphy I would not consider taking them across the pond.
Good luck in your decision,
Cody
Yes, ammo is an issue when traveling. If traveling on safari where there is a caliber regulation, and, you have reloaded your .416 Taylor using .338 Win Mag brass, since it is NOT headstamped .416 Taylor, they will not let the ammo in to use, you must have head stamped .416 Taylor brass.