Results varied wildly, and I was having difficulty because of poor indoor lighting. But I was able to get these results filling with brocock stirrup pump (tuned for higher pressure, 230-240 bar)
ME Bull Barrel 5,5: Between 130 and 135 m/s with 14 grain pellets: between 7.8 and 8.5 Joules. Some shots were much faster, some much slower.
ME SAA 5,5: My SAA has a washer glued to the barrel to reduce barrel- cylinder gap, and an original Colt SAA mainspring to fire the cartridges with higher pressure, since the original spring is weak. Results: between 137 and 145 m/s, (between 8.5 and 9.7 Joules) which makes is faster than the ME Bull Barrel after my modifications.
I will conduct more tests when I am able to take the guns and chronograph outdoors.
Harry, translation for your friends?