Each one has its uses.
gray, brown, green, yellow
No such thing. You can have small caliber but not low caliber.
If you are reffering to speed, there is no calliber that can beet the .177. You can get a .177 gun that shoots anywhere from 150 FPS to 1200 FPS. There is a catch though, because energy is calculated by mass X exelleration, you can learn that where the .177 has high speed, it has very low mass. If you got a .20, .22, or .25 calliber gun, than you would have very low speed but very high mass.
Not sure where Hilti starts their lowest level, so I will start at the absolute lowest. From low to high, grey, brown, green, yellow,red. I think they start at brown.
In cribbage, it is better to play with aces as low rather than high.
Low rise are better
Usually low resistance is better.
Not firearms related.
THE GUN IS A .44 CALIBER SHOTGUN, NOT A .410 CALIBER. I HAVE BEEN TOLD THAT IT MAY HANDLE VERY SHORT .410 CALIBER SHOT SHELLS OF LOW POWER BUT, IT COULD RISKY.
low burn your hair with high
Depends on the gun. As low as $50, as high as $50,000. Most are between $150 and $600.
It not worth the effort. First of all the bb's would have to be .177 in caliber. The gun would really have to be low powered or it may shatter the bb's. It's best to give up this idea. If the gun is not designed for plastic bb's then don't try it.