Losing contact with practical reality and conjuring up a theoretical Double round I would be fascinated to see if something like a

300 Utra rimmed

could be Double material with reduced pressures with 200 gr ammo from 200 gr at 3000(non-rimmed) to 200gr at 2800(rimmed)and regulated for distance at those velocities.

Did Curl once say he had a 300 Win Mag in a Double? That would a high velocity Double to regulate.I may be in error here.

Why would hunters and myself be even interested in such a gun other than it being a novelty or unusual???

Because at multiple times in the past I have shot animals and needed an "speedy" 2nd shot to put down the animal that racking a bolt just can't do.The animal is off when he might be on the ground. I applaud dnovo and xausa but I can only approach that bolt speed with my 270 off shoulder.I suspect most bolt hunters are similarly handicapped.