Hello guys,
I am not sure if you guys knew this, but a quick way to (roughly) test the energy of a gun is by shooting into a coke can.
Using 0.2g bb pellets, hold the muzzle about half an inch away from the surface of the can, at right angle, holding the can in place:
Shooting into the side, if the pellet penetrates only one side and remains in the can >1 joule
If the pellet penetrates one side and tears (not a clean, round hole) through the other ~1.2 joules
If the pellet penetrates both sides cleanly (nice round holes) ~1.4 joules
Shooting into the bottom of the can, if the pellet penetrates the centre of the bottom ~1.6 joules
If the pellet penetrates near the rim of the can ~1.8 joules
This is the case with the older 350ml cans, but they only selling the slightly thinner 330ml cans now. Shouldn't make much of a difference, but please do bear this in mind!
Convert the energy into fps or m/s using the kinetic energy equation we all loved from school - E=0.5*mass(kg)*speed(m/s)^2
350fps with 0.2g pellet is about 1.14 joules.
I hope this helps.
Stay safe!
EDIT: the can must be empty first!