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[/QUOTE]

#1 Yes!

#2 Yes

#3 No

#4 NO

#5 No rounds are not accurate, or inaccurate, that is the job of the rifle

[QUOTE]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?

[/QUOTE]

The weight would be in the ball park, and so would be the 250-300 yds, and you are correct that most Americans think the double rifle is a short range rifle. They are wrong in that thinking, however!

[QUOTE]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.[/QUOTE]

The 9.3X74R double rifle , properly loaded will do just fine at 250 yds, and beyond!

[QUOTE]Is such a Double round out there with such potential? No??[/QUOTE]

Yes, there are several! The 9.3x74R is the best of the lot, because it has power for very large animals, yet is flat shooting enough, to handle 250+ yd Elk, or Moose, yoet is fine for cross canyon deer hunting, or shooting across wide expances of grass to prong horn. However, the 7X64 rimmed, 7X57 rimmed, the new 30 Blazer, rivals the 300 win mag., and all properly loaded will handle ranges the shooter can't!

[QUOTE]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?[/QUOTE]

The double rifles in Austria, and Germany have been doing just as you request, for over 90 yrs. I have an 8X57JR double rifle that I've taken Muledeer at over 200 yds, and a couple of 9.3X74r Doubles that will make the same route every day of the week, just like the mail man, same spot every time!

[QUOTE]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??

Yes they can, and are used every day of every hunting season, for all the game animals in the western USA, Canada, Alaska, and in the alps of Europe that make the mountains of North America look like mole hills!