I got mine recently with the 6" barrel.
0,25g: 173m/s = 3,7J , 0,45g: 135m/s = 4,1J
On short distance with the 0,45g BBs it even penetrates the thick soup cans onesided.
Shot it on 8m, but I would say, "bulls eye" is only possible up to 5m.
If I can test it locked into a vice...