I've exclusively used a Double (470NE or 450-400) on buffalo since 2021. I use only Swift A-frames and
have had stellar results on no less than 10 buffalo including 3 last month in Uganda. About 50% on bullet recovery especially with the 450-400 which consistently out penetrates the 470. Two quick shots out of a double with the first in the shoulder or double lung and second in the pelvis or what
ever shot presents itself. I carry 2-4 solids in my culling belt if there are any chances of elephants being an issue. I have shot all but one in the last 5 years closer than 40yds, several 25 or less. Shot a nice bull last year at 104y in the head (only shot that I had on the best bull in 10days) Bang, flop, dead.
I like to get in close, down wind, "when you can smell their breath you are close enough to kill them", Tracking solitary or small groups of Dagga Boys.
September for Tanzania for 2 back-to-back 10-day hunts which will allow up to 8 buffalo total. Goal for a long time has been a true really old Scrum Cap and if I ever achieve that I may be done hunting
African Buffalo. Getting in really close may end my hunting before getting a Scrum Cap does, it the risk I'll take.