What caliber (not cartridge) is best for short barreled rifles when shooting heavy bullets?

[deerhunter628]

Now it sounds like it could be the 7mm Backcountry.

 

[The Guide]

Now it sounds like it could be the 7mm Backcountry.

If that technology correlates to other cartridges in standard actions, it really could be a game changer. If we look at the 30-06 with a 18" barrel losing 200 fps from a 24" barrel and still being a 550 yard rifle at sea level but but the new case design gives an additional 200 fps then your a 675 yard gun at sea level. Take that to 5k feet and you go from being a 650 yard rifle to an 800 yard rifle. If this technology translates to other cartridges it will make short barrels common and suppressor use easy.

Jay