I did some down range velocity testing with a thingy on the end of my barrel on the indoor range, chrono was at 27 yards, Skan Diamond, using the muzzle average from 10 shots and the down range average from 10 shots my Exact 4.51's produced a bc of .0264. this is not the highest I have seen. So I do believe when others see high down range figures for stripped pellets.
The problem the op experienced in my view will be an off centre bore in the barrel, I have seen this on most makes of guns including a Steyr that clipped inside a Steyr double cone stripper. I suspect this as all the UK Neils strippers I have seen have been machined perfectly central.
HFT, for people with only 2 buttucks!
VooDoo TwoTwo The next chapter.