After having a little trouble with my BAM out of the box (it wouldn't fire when filled to 200MPa), I have been doing some research and also personally experienced that filling to 200MPa with these guns is a waste of air.
Those that fire at 200MPa out of the box, end up firing at very high velocities as the pressure drops to 150Mpa and below. This is OK if shooting at targets at 10m, but at greater distances you need to be shooting in the "sweet spot" for any consistent accuracy.
The guys on the yellow forum (Rich, etc) who arguably pioneered the power tunes for these guns, all fill to much lower pressures and still get decent shot counts.
I find that personally I seem to get the best results with mine if I fill to only 160MPa, and I still get 100 shots at 10m distances. I reckon at greater distances I would get only 40-50 usable shots before a refill, and any shots at fill pressures between 160 and 200MPa would be way inconsistent with those between 160 and 100MPa.
I guess then I should not have been concerned about my BAM not firing at a 200MPa fill, as it fired OK when I dropped the pressure to 160MPa and that seems to be where the "sweet spot" starts anyway.
BTW my BAM has a 1.4mm transfer port and I fitted an allen key grubscrew to adjust the power through the safety catch screw hole (thanks Wyan!). If I adjust the power so it fires at 200MPa its too powerful in the "sweet spot". If I adjust the power down with the screw it doesn't fire at 200MPa, but I don't think it is anything to be concerned about.
Has anyone had similar experiences?