Depends on what firearm has a 22 inch barrel. If it is a .22 LR, it can shoot about a mile and a half- or 100 yards accurately. If it is a 30-06, it can shoot about 5 miles, or 500 yards accurately.
It can shoot up to 800-900 meters depending on the barrel.
Depends on the caliber, barrel length, projectile weight.
A red dot sight isn't very good with a paintball gun, unless it is used completely still with a bipod, using premium paint and a high end barrel. far range you can see who your shooting at. 12-14" the optimum size for a barrel. Though straight rifled barrels are more accurate than say, a Tippmann barrel, the most accurate barrels are two piece barrels, with changeable bore (diameter) inserts. Then you can overbore (have barrel slightly larger, and by slightly i mean .01 of an inch) or underbore (have it slightly smaller than the ball) or try to get it perfect, but paintball generally are not perfect spheres and vary by hundredths to tenths of an inch depending on paint quality.
It's supposed to shoot 10.7 m but it's more accurate when you take the barrel off. (yes, it comes off)
Depends on the ammunition. Rifled 12 gauge slugs are accurate to about 150 yards
The only way to know is to shoot both.
It starts to drop the instant it leaves the barrel
It depends on what your after. For ruffed grouse I would chose a 26 or 28 inch barrel. For pheasant I would use one with a 30 inch barrel. It all depends on what you hunt and how far out you want to touch. Then that will take you into what chokes you want for the gun you'll be using.
It depends on the caliber and the barrel length.Also, the "effective range" is not the same as how far a bullet will travel.A .22 can fly more than a mile, but it has no "stopping power" at that range.
Their is only one way to make a paintball marker shoot further. That is to increase the velocity to make the paintball travel faster, thus making go further. This however is prohibited by tournaments and fields. The maximum allowed velocity is between 300 and 275 feet per second. The only other way which only applies to Tippmann owners is the flatline barrel. This barrel puts backspin on the ball making it go a considerable distance further. The barrel is though inaccurate at longer distance. Contradictory to what most say a longer barrel won't make the ball go any further. You only need around a 12 inch barrel to provide adequate accuracy.And they hurt somewhat.
A 150 grain bullet shot from a 308 will start dropping the fraction of a second it leaves the barrel.