I used my 375 H&H with 250 TTSX to take my eland. Worked perfect! Using the same it worked well on croc, sable, black wildebeest, warthog and even on caracal hitting it low from the front so not ruining the Cape.
If you're looking for a factory Swift A-frame, try Swift’s factory load. 3/4” groups at 100 meters from my MRC.
The Barnes factory 300 TSX shoots extremely accurate as well. I took Cape buffalo, bushbuck and bushpig with it, but it is a little hard for the smaller animals, so you have to place a killing shot well.
I have found that the Barnes are most accurate from a dirty barrel.