First semi-serious target shooting the oldHW80K...

Yeah mate but the springers are cheap and frankly I went PCP simply because my springers are too heavy for standing shooting - or in spite of my Armstrong name, I'm way too weak. :-)

Both Paul and Pete have been very helpful in advising how to plot a power accuracy curve but so far I'm amazed there is much of either left at under 100 bar...makes me want to keep trying as the tank empties ha ha. Maybe I also need to try low power with low pressure. Hmmmm....stuff the work. Best I do that now.

So it's probably more efficient at high power.
The power wheel is only 3 different sized port holes, so gun uses the same air for each shot, and it's likely that low power just restricts flow and after the pellet has left the barrel, air is still being released, where high power all the air is transfered to the pellet.

Sounds like high power is the better setting, especially if it's more accurate. Too much air disturbance behind the pellet could cause inaccuracy.

Looking good!
I'd say on high power it likes the 8.44s

Thanks Paul - that makes a lot of sense and spells out exactly what i need to do. 

But TBH, I need to improve my shooting... at least start using a bench rest which for some reason my very old fashioned hunting trained brain tells me is cheating. Target shooting with low heart beat is just not going to happen in a paddock :-) Why I favour using my front arm and maybe FTT shooting but my arm is very clearly less stable than a rest. But rests are the status quo for much target shooting and it makes sense to do everything to get good groups while learning and especially while testing un-regulated pressure's affect on V and trajectory. I have some sand bags to fill...

Paul is there any other details with that ply bench plan? Maybe a better file? I think it's an excellent idea and just what I need for shotting across the full width of my back yard...    

I'm thinking of visiting the Morrinsville FTT meeting 26th or 27th of next month for a look-see. 

Will any of you forum members be there - it would be good to catch up...

Thanks Pete,
No regulator on the older Cyclone. 
My somewhat subjective view is that when pressure dropped down to under 140 velocity/force starts to drop fast - I was missing some plinker steel targets that should have been easy. I'll throw some more lead around with chrono as pressure drops and see what happens...

Paul,
You fitted a regulator to yours... I assume for more consistent shots? You would need more for pest destruction I guess. I'm not yet feeling a need for a regulator but if I was shooting as straight as you expert guys do then it would become more important when pressure drops enough that it's the rifle's fault the groups open out...in which case I have a couple of old dive regulators in good nick I might use.

I think I started with the bottle at around 180 when i bought it and have put around 100 shots through it, all but 4 shots (for the chrono) at low power so my guess is I should expect the un-reg pressure drop to start showing itself.

NB You will no doubt be realising I am a bit of a propellor head and like knowing the stats...so sooner or later in the back yard I'll chrono each power setting as the pressure drops from a full tank and see what happens. I think the China-chrono is working OK but fails and needs a shade with any direct sun at all.

Wireless to phone it don't do and I paid for that and Alliexpress was not helpful at all but hey, it's a cheapie and works as well as I could expect so all good and gives me something to grizzle about - without something to bitch about we can't really be 100% happy right? :-)