Woodleigh soft
Interestingly
VertigoBE, the designation on the website (SN- soft nose) does not match the designation on the boxes of ammo (RNSN - Round Nose Soft Nose), which is why I called it that way, but the stock number is the same No.20195252, so there is no doubt we are talking about the same thing
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.375 H&H for DG
Agreed 100%. Sorry if my writing implied that I had misunderstood your point
.300 vs 7x65R
Undoubtedly, the .300 (of whichever denomination) will give you a flatter trajectory and better reach than the 7x65R, therefore from a pure ballistics perspective, it would be "better."
This being said, as you well know the 7x65R is no slouch, and if memory serves (I have a 7x65R Kipplauf rifle too
) the RWS KS 10.5 g (162 gr) flies out the barrel at 820 m/s (2,690 fps) - maybe a tad less from the 63.5 cm (25") barrels - which is not all that far from the 2,850 fps that the .280 Rem achieves with a 162 gr slug, and nobody ever accused the .280 of being a short range cartridge
To make a long story short, I would not feel disadvantaged with the 7x65R out to 300 yards, and I guess that in this specific case, the choice would rest as much on irrational considerations (likes & dislikes, mood of the moment, etc.) as it would rest on rational reasons
That is assuming that the 7x65R barrels group, but I am not too worried about that
This being said, it is a time-honored practice to take along double and bolt-action and ask one of the trackers to carry one of them. I do it myself all the time when hunting DG with the .470, initially with iron sights and now with red dot, for closer work, and a scoped bolt action for longer work. In your case, the double itself being scoped, the need is probably lesser, but still perfectly rational
Shooting off the 7x65R barrels...
I am also not too worried about that, unless you shoot thousands upon thousands of hard steel jacket slugs, which you will not. Typically 7x65R copper jacket slugs will just slide through there like greased billiard balls. Your great grand-son may want to check the rifling in 75 years, but this will hardly be your problem
300 gr .375 H&H
Entirely in agreement, the 300 gr loads have been the .375 H&H iconic loads, and they are now better than ever with modern bullets, especially TSX and AFrame. I find the 300 gr TSX devastating on larger PG, and with the BDC Leica 2.5x10x42 on my R8 barrel it will shoot as far as I ever care to.
VertigoBE may (?) be lucky, and his rifle may (?) also regulate well with 300 gr slugs (although obviously to a different point of impact), but if it shoots markedly better the 350 gr Woodleigh for which it was regulated, then the Woodleigh 350 gr soft & solid, will serve just the same purpose just as well, admittedly with a little more recoil than the 300 gr
(and also a noticeably heavier punch on the big stuff, which is why I used it with the Leica 1-6x24 for Elephant scoped backup, although I will likely retire the use now that I have added a .458 Lott barrel to the R8 stable
).