If we're talking nostalgia and efficacy in hunting I think there's a case to make that everything introduced after the late 1930's is just marketing.
By that time we had 6.5x55, 270, 7x57, 303B, 30-06, 8x57, 300H&H, 318WR, 8x68s, 333J, 350 Rigby, 9.3x62, 375 H&H, 404J/450-400NE, 416 Rigby, 450...