Its not whether the round ball can hit a target at 50 yds, but whether you can hold the gun and fire it while keeping the front sight on target that is in issue with a " blanket gun "
Does the term, " sawed off shotgun " mean anything to you? This was one of the first examples of guns being cut down at both the barrel, and stock, so that they could be easily concealed. It becomes a point and shoot weapon, and not a firearm that is aimed.
50 yards would definitely be a long shot for most shooters, and getting any kind of consistent groups with such a gun would be almost impossible without a buttstock long enough to mount to your shoulder. You also need to check with local state firearms and game code laws to see if such a short barrel gun is even legal to use to hunt any game. I know the Illinois had a minimum length requirement for barrels on ML rifles, or smoothbores, as well as a minimum caliber. Other states often have similar restrictions.