I am not going to bash the Blaser R8 as I took 8 species with it just a month ago. That being said the two barrels are a fallacy in utility.
I took my Hyena on the way to where we were going to start tracking for elephant (as a matter of fact Hyena was at 6:30AM and elephant two hours later). Took a zebra on the way back from tracking buffalo. I took a baboon while having a lunch break during buffalo tracking. A grysbok was also taken while searching for kudu, but by that time I had already packed my .500 NE anyway,
In none of the above cases there would have been time to switch barrels for the right caliber for the game. So, one would lose opportunity to take PG that one runs across while searching for DG. Now, after the DG is in the salt, sure one can then switch barrels to the PG barrel and go on.
On an RSA game ranch, yeah as one is going from one fenced enclosure section to the next for that day sure it comes in handy as one already knows what's on the menu for that outing and has the appropriate caliber.
You keep making this point
Tanks, and you seem to be bizarrely unwilling to accept that for most folks the concept of changing barrels on a Blaser is not something that happens willy-nilly, on the trail, in the truck, several times a day, on the spur of the moment, depending on what animal you are bumping into, and it does not have anything to do with which Country you are hunting.
What the Blaser barrels change capability is meant to offer, I believe, and I think most believe, is the following example using my 2022 African trip:
Objective of week 1, Lion in the Kalahari: .458 Lott (admittedly I would have selected the .375 H&H barrel myself, but the PH insisted that I bring a .458 if I owned one - sure, why not).
Note: obviously not a free range hunt in SA, but I can assure whomever cares to compare, that there is not much difference in my experience between tracking elephant on foot all day on tens of thousands of acres (this is about all one can walk in a day) of communal land in Zimbabwe, and tracking lion on foot all day on tens of thousands of acres of private land in the Kalahari
Objective of week 2, free range "best-in-class" Southern Greater Kudu in the Kalahari and free range "best-in-class" Eastern Cape Kudu: .300 Wby.
Objective of week 3, free range "best-in-class" Bushbuck on the Groot Visrivier, and free range "best-in-class" Vaal Rhebok in the Karoo: .257 Wby
Let me hasten to say that I happily concede that the Vaal Rhebok is not, by a substantial margin, a "best-in-class" specimen - one cannot win them all, despite best and sincere effort and total dedication - but I would be hard pressed to be unhappy with him as this was still an incredible hunt... But the two Kudus and the Bushbuck, are "best-in-class" specimen, and each of these animals took a very focused, very single-minded, and very selective hunt, passing a lot of nice but lesser animals, and in two cases ending up in very specialized shooting situations where optimum rifle/calibers (and scopes) made a difference.
Multiple barrels "a fallacy in utility"? Really?
I can assure you that the chances to bump into a Vaal Rhebok while hunting Lion are quite remote, and that the .257 Wby was a much more adapted caliber than the .500 NE for the longish shot on this hunt.
I can also assure you that the chances to bump into a "best-in-class" Eastern Cape Kudu while hunting either Lion or Vaal Rhebok are quite remote too, and that the .300 Wby, and its large objective scope, were about perfect to take that last light, even longer shot.
As to the chances of bumping into a Lion while hunting either Eastern Cape Kudu or Vaal Rhebok..................
So, this is not really about changing barrel 3 times an hour in the truck depending on whatever you are bumping into, like you enjoy swapping your 2 doubles .500 and 9.3 on your whatever-pops-up hunts - which is great, I zero issue with that -
this is about being able to bring several optimum calibers for several very specialized, very focused and very difficult hunts for several very special animals.
Sure, one can bang Zebra, Baboon, Hyena, or whatever walks, with whatever rifle one has in hands while hunting DG, but the minute the hunt focuses on one specific best-in-class animal of one specific species, and not just any decent representative of any species, things become very, very different.
Sure, I could have gone after it all with the .375 H&H, and I would have collected the Lion just the same, possibly the Southern Greater Kudu, on which I got a relatively close shot at just above 200 yards, but the hunt for and the shot on the Vaal Rhebok would have been quite challenging, and I would not have even attempted the shot on the Eastern Cape Kudu. I could certainly have bagged another Eastern Cape Kudu, we passed plenty, but not that one, the rifle/caliber and scope would have been a limitation.
This is where the Blaser multiple barrels (and scopes) shine; and this is no "fallacy in utility"...
Actually,
Tanks, you are doing almost the same thing yourself: you are bringing a Heym .500, a Heym 9.3x74R, and apparently now a Blaser (in .300 RUM if memory serves? so you clearly see the limitation of only bringing DG calibers, right?), and I would not think that you are thinking of these as a "fallacy in utility".
So, OK, you are still hunting everything at the same time, so you need 3 rifles ready to fire, I get it, and 3 barrels would not help you, but when you start hunting very selectively, you will see the other side of the discussion. I am guessing that you would not take your .500 on a Marco Polo hunt, right?, so you are already halfway there
. Anyway, I will not call it a "fallacy in utility", but just a different choice 
. Perfect illustration that sometimes one does not need to dedicate days of focused and exclusive hard labor to collect a best-in-class animal. Right time, right place, and capitalizing well on the opportunity (which you clearly did 
) are all it takes. Nothing beats luck when it comes to finding the really big ones, I have had my share too 
