S200 string

[Dan]

I thought after I calibrated the combro I'd do a shot string. I'm not sure myself what I'm looking for but I'll post the results underneath and hopefully someone can tell me if it's good or not .
AIR ARMS S200 .177 HUMA Regulator
Using bisley magnums 10.4 grains I didn't weigh the pellets .
Started at the recommend 210 Bar fill pressure
1: 687
692
692
695
693
695
695
693
692
693

696
696
695
689
696
688
691
695
691
696

695
696
696
691
692
692
693
697
695
690

691
692
695
695
699
698
697
695
702
695

697
698
700
695
694
699
698
698
695
697

700
699
700
697
698
701
697
697
699
698

699
700
700
698
699
700
699
703
700
703

703
710
710
706
710
703
706
708
705
708

706
702
702
694
695
688
687
683
678
673
677
661
622
607
601 shot 95
90 bar left

[Mark112]

Hi,

Just done he graph for the above data and it looks like :-

S200Huma.jpg (151.74 KiB) Viewed 3163 times

There is a bit of a spike at the end of the string. I'm guessing that this is where it comes off the regulator and your rifle is more efficient at these 'lower-than-reg' pressures. What is the reg pressure set to out of interest.? Is it around 120-125 bar? To me it looks like the reg pressure needs to drop by 5 - 10 bar to get rid of the peak at the end. This may raise the power levels of the shot string so you may have to tweak the whole lot down a bit by whatever means you do this on an S200. Robert Lane's videos on youtube show this phenomenon (especially Pt. 7-7 power spike after cut out).

Mark

[Dan]

Thank you Mark I really appreciate the effort . I'm not sure what the pressure is set to I brought it ages ago I'll try and find out .
Atb
Dan

[Geordie]

Numbers look pretty damn good Dan. How many shots were you getting before you regged it?

Mark knows his stuff when it comes to numbers/strings so take his advice, it all looks pretty consistent until it tails off the reg at the end.

Ps.....little tip for you, post your numbers in rows of ten, much easier to follow

[Dan]

About 30/35 useable shots mate . Haha I thought about putting them in rows of 10 then I thought why make it easy

[Raj]

80+ consistent shots with an acceptable shot-to-shot variance out of a puny cylinder like the S200 !!! You should be proud of it
Hmmm ... wonder who tuned this one

[Dan]

Raj it's fantastic mate I'm over the moon with it.
Some bloke in rugby tuned it Raj he knows he's stuff and makes a pretty decent sandwich and tea








P.s can you remember the pressure the reg was set too?

[Geordie]

I thought about putting them in rows of 10 then I thought why make it easy

Git!!

[Raj]

I honestly cant remember but I think it was 100 bar. My Altaros Reg. that works on exactly the same principle ... i.e. removing the O-ring between the end cap and the air cylinder to allow a breather hole - displays the same spike towards the end of the string.

[Dan]

I just got the piece of paper out that come with the reg it is set at 100bar good memory Raj