In 375H&H, what would be your choice of 300gr bullet manufactured cartridges for heavy game, in particular Buffalo, but also Eland or Sable: Duo DGX/DGS or TSX?
Note that A-Frame is out of scope, impossible to find any Federal apart Power-Shok...
Bonjour d' Arizona Olivier
I have used both, and objectively both work with some caveats:
1-- I would not use solids on Buffalo, at least on a first shot. Modern solids, including the DGS, will generally pass through Buffalo and you are at risk of wounding or killing a second animal behind your intended target. Intuitively, solids make sense for the follow up, especially if you think in terms of follow up shots at a Buffalo lengthwise (from the front or from the rear), but it is hard to predict in a follow up, and if all you are presented with are side shots on a Buffalo running among other animals (a very common scenario, if not the most common), you better not shoot with solids.
2-- Although the original DGX had documented issues, the DGX Bonded that replaced it a few years ago has proven reliable. Whether it will be able to shake the bad reputation of early failures, is a different issue, just like the .458 Win reputation still suffers from the original 1956 load failures... At the present I would say that the answer is no... regardless of actual performance.
When everything is considered, the reality is that the TSX is an "expanding solid": it is physically a solid homogeneous bullet, and it penetrates like one, and its hollow point allows it to have controlled expansion, and its nose does that. In so many words, the TSX performs double duties as soft and solid, first and follow up shots. I now use nothing else in my .375 H&H, but also in my .458 Lott, my wife's 9.3x62, and TTSX in my .300 Wby and .257 Wby, and her .270 Win, and I would recommend that you select it.
A word of caution: if anything, the TSX is almost too much of a solid, and in a perfect broadside shot where it only encounters ribs and lungs, it will punch through a Buffalo... Actually, and to the profound chagrin of a few AH members who swear by overweight truncated solids, there has been entirely reliable feedback of a professional using the TSX to cull elephant with frontal brain shots. I have personally zero doubt that a TSX will penetrate Buffalo, Hippo and Elephant skulls like hot knife in butter.
Beside, the Barnes factory ammo is extremely consistent, always available, and very reasonably priced.
Bonne Chasse!
Pascal