JSB exact diabolo 8.4 and that was with a full fill of 3000psi to almost empty it's regulated at 1500psi so I can't go under 1500psi.
and yes if anyone want's to test this I willing to let you or them do it. but you got to re fill me tank after. pump it up.
I fillled the tank on my air gun so the airgun chamber made the air tanks bigger I'm sure that help and I have a drop down tank block too.
I'm very happy with my QB best airgun I ever had or modded. but we did have some problems lol.
Well it can, and will, go under 1500 psi, that's why I asked.... What the velocity does at under 1500 psi depends on the hammer spring, and with a cut spring you could well be shooting down well below 1500 psi before the velocity falls off (I know because I've had guns set up that way).... I had one QB set up for 640 fps with 14.3 gr pellets (13 FPE) with a 1500 psi regulator and after a very long string (~180 shots) the velocity started to CLIMB at 1400 psi, peaked at 780 fps at 900 psi, and then fell back to 600 fps at only 500 psi.... If I hadn't looked at the gauge before refilling it, I would have assumed that I got all those shots above 1500 psi, but in fact the last 50 shots were below that.... It gives a false impression of the actual efficiency.... My gun was getting 1.82 FPE/CI in .22 cal, which was quite spectacular.... Of the 230 shots, only 180 were actually above 1500 psi....
The bottom line is that you can get a LOT of shots with a QB if you dial the power back.... Fun guns for sure !!!
Bob
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count!
it's a toy for big boys. tunner modder like me.
Ya I did have a climb in fps but not much but yes I got up to 780fps but I never drop under 760 till I pass 272 shoot after that I got like 25 shoot from 750 all the way down too 700fps then I stop since It was
Under my normal fps of 760fps.
I instal a Gamo targget in a platform in a tree at over 60yards a really far shoot and took it down 3 out of 10 but at 40 yards took it down 10 out of 10 I'm really dialing this QB in what a wonderful air gun after
you have played and tuned it a bit or a lot :P I have had some problems with it but all ok now the valve was bad but got a oem in it now and I'm keeping it like this.
now On my way to work this morning ( 45mins) drive I was thinking how many shoot could I get out of a 90z co2 tank close to 500 probably but would probably shoot them at 490fps.
sorry for my speling misstakes but I'm french and I write even worse in French lol it's even harder.
Frank, I am getting abt 750 shots from a 20 oz CO2 tank tethered to my .22 cal AR2078, with 13.4gr JSBs flying at 480 fps.
I haven't tuned for efficiency, yet. It's next on my learning curve.These rifles are very satisfactory in the accuracy department.
Member, Limestone Beekeepers Guild
Duke ))))----//----------==
wow 750 on 20oz and you did nothing to make it use less so your on the way to beat me. lol
It's not that good.. if you consider you can typically get 40-50 good shots from 2 (edit) x12 g cartridge, you could theoretically get over 1000 shots from 20oz of CO2. Have you considered Steve Woodward's HDD device? He claims (well Archer is the main retailer, so its 3rdhand through Archer) to increase shot count "up to" 50%.Originally Posted by FRANK
Last edited by Dukemeister; Aug 13 2012 at 06:41 PM.
Member, Limestone Beekeepers Guild
Duke ))))----//----------==
My shot count is better then I ever expected so no need for me. and yes i did see it looks like a good idea to stop hammer bounce.
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