I don't care which category the forum owner puts .375
What matters more is what the forum members keen on Africa or just the .375 calibre alone , sensibly deem .375 to be.
How about asking WeatherbyNation.com folks if they consider 375 Wby and 378 Wby to be medium or big bore..?...or shoot H&H London, Purdey, Westley Richards and Rigby an email and ask if .375 is medium or big bore?
You are talking like just because a small number of forum owners seem to agree with you , that you must be correct ..
Long before forums came about .375 was understood to be medium and plenty still hold that view despite what a new age net moderator wants you to think.
-Bulletproof and Waterproof don't mean Idiotproof.