Pretty simple physics, all guns kick relative to the power of the round and weight of the firearm (yes including the 270) and yes all guns make noise.
https://www.chuckhawks.com/recoil_table.htm
I think the myth started when the 270 started to gain popularity (Just after WW2 ) and if you compared it to what others were shooting at the time (mostly surplus 303) then it would have been louder and more kick because it was more powerful than what they had been used to. Now that most modern cartridges have lifted in their performance and are more readily available the 270 has not lost its kick or noise, but rather the other firearms are now doing the same.
If you compare a 270 or most modern cartridges to a 303 then they will likely all kick a bit more and make a bit more noise, but probably more accurate to say the 303 does not kick quite as much......
Thats my understanding on it,
If we suddenly had dinosaurs running around here and the 375 H&H magnum suddenly gained popularity and become the next common calibre hat everyone shoots, it would gain the reputation of more recoil and more noise, but as more calibres in that same power level become more available and common again it would be that the level of recoil is "Normal"and the older calibres (308, 270, 6.5 CM 30/06) would feel a bit soft and gentle....)
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