Not necessarily a "new" double cartridge would be needed, but something more available to the tune of a .318 WR. .333 Jeffrey or a new .338 NE would be more than useful.

Shooting bullets with a weight of around 225 to 250 grains. With a muzzle velocity of around 2150 to 2400 fps.

Would make a fine medium game light weight double rifle, useful on driven game and if loaded with a 250 gr to 300 gr RNSP's/FMJ's probably capable of taking dangerous game.

Of course they will do nothing a 9.3x74R won't do with a 286 gr bullet, but that is not the question.