Quote Originally Posted by robinghewitt View Post
There used to be a thing on long barrelled springers that you could increase the power by sawing the end off a bit.

The only possible explanation is that the pellet was actually slowing down towards the end rather than speeding up.

In old fashioned cannon the optimum barrel length was 25 calibres, (probably need a bit more in an airgun, I just put that in for fun)
This extra mv through shortening a barrel could be due to the choke being removed preventing the pellet from being decelerated by the narrowing of the barrel more so than the effect of the barrel being shorter.
I could be wrong but i think its more likely than the barrel being more efficient shortened.
Rhys