My Hammerli Air Magnum 850 is now a PCP. Shot it for the first time on Sunday. I was using the open sights as the Leapers is on the Weirauch at the moment. She now carries the range at Northcliff. Maximun charge at the moment is 160bar as from 170 she feels as if she is about to lock down. As I only had access to a hand pump I did not try and see how many shots from a charge or the bandwidth of the sweet spot. She does appear to be very economical as I was only having to pump 20 bars after 40 shots. The next mod is going to be a stronger and slightly heavier sliding hammer block and possibly a slightly stronger spring and a metal spring guide. Oh yes, and a metal trigger to replace the awful plastic unit fitted by Umarex. When the Nikko gets back from the importers is shall fit a scope and then look at grouping, FPS, etc.