Had some time on my hands the other day, wondering how diminishing air pressure would affect pellet velocity on my HW100.
Thought this might be of interest to the Members:
The velocity regulation was quite good, with a 12.2 fps deviation (STD) over the range 200 to 100 bar, with the velocity only really tapering off around shot 46/47.
The variance between the highest and lowest recorded velocity over 43 shots was 43.8 fps.
Accuracy was also very dependent, degrading only around shot 50.