Ah, the good old CRF issue...
I am on record for observing that the two reasons CRF and its characteristic big external claw extractor were perfected in the 1890’s by Paul Mauser, at the request of the German Imperial Army, were to:
1 --- prevent extraction failure of the pure copper shells loaded with black powder, that were notorious for sticking in dirty chambers after sustained fire.
I reckon that brass shells loaded with smokeless powder resolved this issue a long time ago. If a case gets stuck nowadays, Mauser claw extractor or not, the action itself is stuck, short of a rubber mallet.
2 --- prevent 1890’s peasant conscripts who had never handled a bolt action rifle before, to jam the rifle by double feeding and risk detonating the cartridge in the chamber with the tip of the spitzer bullet of the cartridge being rammed into it; or to load the rifle inadvertently by pushing a cartridge in the chamber and leaving it there.
I continue to appreciate the fact that in a true Mauser CRF rifle it is impossible to close the bolt on a cartridge inadvertently pushed in the chamber, and I only wish that no CRF extractor would be beveled to allow it to jump the rim of a cartridge already pushed into the chamber - as some manufacturers do, thereby negating this feature. This would make it impossible to load a CRF rifle inadvertently, and to fire it accidentally.
In truth, assuming,
revturbo9967, that you will not use circa 1890 black powder loaded soft brass shells, and that you will handle your rifle responsibly, the stark reality is that push feed rifles are every bit as appropriate on safari as controlled round feed rifles.
Certainly, if starting from a clean slate, and any other consideration being equal, CRF cannot be viewed as a negative, and I do see it as a positive (I am also on record for being a strong supported of the CZ 550 magnum action - of which I own several in DG calibers), but it did not bother me in the slightest to NOT have CRF on my Mark V .340 Wby or my Mark V .257 Wby when I took them to Africa, and it does not bother me in the slightest either to NOT have CRF on my Blaser R8.
Your plan make absolutely perfect sense, and I would say that depending on your objectives, the calibers that may make the most sense for a Mark V re-barrel, with Africa in mind, could be:
- .300 Wby: the penultimate "any plains game / anywhere" caliber. Of course, the .340 Wby is always in the run for the heavy PG, but in truth now that the .300 benefits from modern slugs such as TTSX or AFrame, the .340 is overkill for all but the largest PG (e.g. Moose or Eland), while it is not legal - although it would do the job nicely - for DG.
- .375 Wby: with 250 gr slugs it gives the .375 the reach that the H&H almost but not quite delivers, and it steps deep into .416 territory with 350 gr slugs. Or as Red Leg would rightly say, it does everything beautifully with a 300 gr slug. I would still go .375 Wby over .375 H&H because it gives you a lit more, like the various .300 mag over the .30-06, and in a pinch you can fire ubiquitous .375 H&H ammo in a .375 Wby chamber should your Wby ammo be lost in transit.
- .416 Rigby indeed, or for that matter .450 Rigby, which get you respectively in the .40+ and .45 categories, without the substantial recoil premium that the .416 Wby or .460 Wby will exert, for they may indeed be a bridge too far for most of us mere mortals, and long range does not really apply to Buffalo or Elephant hunting.
Sure, some folks do not like the Weatherby stock, which does not mean that it is bad; sure too, some folks have bad things to say about the Mark V action (hint: generally after it has undergone home-gunsmithing wink, wink, wink...); and sure also some folks showed up in Africa with a brand new out of the box .378 Wby they had never shot and got bitten by it (this also happens nowadays with folks showing up with a .375 Remington Ultra Magnum), but do not let any of this deter you, the Mark V has earned its spurs from America to Asia and Africa to Mongolia, from Elephant to Marco Polo.
And certainly, putting together the "perfect" - per your own definition of perfect - rifle for your safari is indeed part of the fun, and in this case I equate buying one with building one, so it seems to me you are solidly on your rocker