First loooong shot string with Royale & HUMA regulator

[mcoulter]

EDIT - Skip down to my 2nd post to see test #2 which came out better (still a work-in-progress) 

Temperature = 43f
Starting Pressure = 212 BAR (all I had in my tank)
Ending Pressure = 100 BAR 
(Pressures measured by stock FX guage)

Pellet = JSB 18.1
Hammer spring = 3 turns out
EDIT - Reg pressure = 110 bar (I misunderstood what line marked the real pressure setting)

Full string results (13 magazines / 156 pellets)
H = 792
L = 719
A = 772
ES = 73
SD = 12.5
Average FPE = 24 
(Yes this velocity is low. I will adjust upwards for next session. I'm pretty sure I'll start with increasing the reg pressure.) 

ProChrono Data from the 1st 99 shots (max shots the chrono's memory can hold)
H = 792
L = 762
A = 777
ES = 30
SD = 6 

Installing the reg was easy. I have had the original regulator out a number of times to adjust. Installing this Huma was no different. Here's the HUMA next to the FX regulator. I was surprised at the size difference. 

Here is a link to my Google Sheets with this data and charts.


And here is the line graph of the full 156 shots:

And when I omit the last two mags and "only" include 11 mags it looks a bit better:

Conventional wisdom is that the regulator consistency will improve as the rifle is shot more.

Oh, here are pix from the starting pressure at the gun and JoeB tank. 
By the time I got my stuff setup outside (cold temps) the rifle pressure registered about 212 BAR.

And ending pressure at the gun:

Targets and chrony data. Targets were at 50 yards on a relatively blustery day:

 

[mcoulter]

OK, I see what was going on!

1) The regulator adjustment screw was WAY easier to turn than I expected. I (thought...) that I was super-careful NOT to move it. Well I did accidentally move it to a much lower setting. This likely happened when I screwed in the set screw on top of the regulator.

2) The instructions say there would be "a very fine set mark" on the side of the screw. I thought that I identified it and it corresponded with 140 bar. 

Actually the mark is a vertical line milled into the side of the brass. How I missed this the 1st time around I will never know! So there's a small dot on the brass above the 140 mark which I incorrectly thought marked the pressure:

Here's the real mark which is now set right at 140 bar. I drew a line on the top of the body to mark the location of the hole lower down on the body. The instructions said to line this hole up with the barrel.

With this set correctly and with 3 turns out on the hammer screw, I got this one-mag string (sorry ran out of time to shoot long strings):

899
907
907
905
909
903
905
909
909
903
908
902

Then backing the hammer spring out to 3.5 turns out slowed it down a bit as expected:

887
887
896
893
888
891
890
891
881
888
890
895

The lesson learned here for me is that the adjustment screw is NOT like the FX at all - it is WAY easier to turn than the FX. This HUMA adjuster can be turned with just your fingers... I'm sure when I screwed that little set screw I dropped the setting down. Right down to 110 BAR! 

:-O

I can't wait to get filled-up and shoot a full string now that it's right about where I want it!

 

[Menttaliist]

110 bar and almost 900fps with 18.1's !?
I cant even get 820fps at that pressure, i've tried with and without hammer weight, my next try will be SHP valve. Nice work and waiting for that shot string!

 

[Hynzie]

that is now spot on sir congrats ,i love when i figure out the errors on my own ,learning good for the brain 860 to 880 perfect,,HYNZIE

 

[mcoulter]

"Menttaliist"110 bar and almost 900fps with 18.1's !?
I cant even get 820fps at that pressure, i've tried with and without hammer weight, my next try will be SHP valve. Nice work and waiting for that shot string!

Nope, at 110 BAR the JSB 18s were shooting at 772 fps.

At 140 BAR the JSB 18s were shooting about 890 fps.

 

 

[Glem.Chally]

Yeah can't wait to see what a full string looks like, nice work!

 

[jking]

Just to confirm, the silver screw stays in place and is loctited to the brass piece? If my Wildcat or Royale ever have any issues I'll probably try one myself.
Jimmy

 

[mcoulter]

"jking"Just to confirm, the silver screw stays in place and is loctited to the brass piece? If my Wildcat or Royale ever have any issues I'll probably try one myself.
Jimmy

Hi Jimmy,

Nope, no loctite. It's just screwed in for the sole purpose of giving you something to latch on to with needle nose pliers when you want to pull it out. 

 

[jking]

Gotcha, thanks