If we want to select/create an ideal Double caliber/round for hunting the Wester USA--primarily whitetail/pigs/antelope/black bear-- and elk/moose at the top end--

What ideal round would you want?

Ideally-

1) You would want it rimmed for fast work with ejectors
2) You want higher velocity with lighter bullets around 150-200 grains for better trajectory longer ranges similar to bolt guns used for decades and decades
3) Adjustable regulation for accuracy/convergence at distance.
4) It will be used more with scope than without
5)The round design would be herently accurate

Your Double rifle requirements would be quality,weight between 7-8 pounds without scope, and accuracy to 250-300 yards!! Most american hunters would doubt this possible with a Double. After all they know Doubles are strictly short range rifles aren't they?

I know the practical easy answer is the 9.3x74R but I would say that is lacks legs/trajectory for the longer distances.Most western shots and animals I have seen taken can go 200+ yards.You wouldn't want you buddies dropping them at those ranges with you just watching or missing rainbow shots.

Is such a Double round out there with such potential? No??

How about a 30 cal/7mm cal Double?? The 30 cal works great in bolt guns and the Double is just the launching pad--

Laugh as you want but I think such an accurate Double pushing a 150-200 gr bullet at 2900-2700 fps would work fine.

How about a 300 H&H flanged or this round wildcatted to 7mm?

Can Doubles be used effectively for Western hunting or would such a Double be impractical/ridiculous?? Should the Double stay in the gun safe so the bolt actions can play??