Popularity has little to do with "killing performance". You really mean to be taken seriously to suggest that a bullet that is .007" difference in diameter is going to eclipse another in "killing power"?
Lighten up. This is just a forum...and it's all for fun.
If you read everything i said, instead of cherry picking,you'd know I think the 280 has nothing over the 270. This business of .007 in bullet diameter making the 280 something special is the purview of the 280 lovers....not me.
So "no" I don't believe there's a difference. Stop putting words in my mouth.
I use them both, interchangeably. There is no difference in killing effectiveness between them. That's bullet dependent.
Popularity has nothing to do with killing effectiveness; but if the 270 didn't work well as a BG cartridge, it would not have sold and been popular.It's record in that regard is obvious. The 280 in all it's various guises, fell flat, because it tried to fill a niche already occupied by the 270,and did nothing really different.
The 7 Rem Mag polished it off. That's part of cartridge history too.
I get the fun part. I love reading revisionist history. I don't care who heard of what in 1925. You had the 270 and no 280. Those are facts.
I think it's silly the topic even comes up....but 280 lovers refuse to let it die. "if this"...."if that"...the 270 would never exist. Hilarious.
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Point is there has been some form of a 7mm (284) on a 30/06 capacity case in existence since 1917-1918 (whenever) and it has not even dented the sales, popularity and big game killing performance of the 270 Winchester,and never will.
Your exact words.
As a note the 280 lovers comment. I like the 280, I've owned and hunted wtih two of them. I have hunted and liked the 270, the 7 Rem Mag, the 06 and several others. I've come to the conclusion, however, that for my type of hunting, there is nothing that I cannot do with a 308 or 7-08 that I can do with the others. YMMV
That's part of cartridge history too. 
