QB79 (.177 cal.) Shot String ->3000 PSI to 1450 PSI

[SpiralGroove]

Hey Guys,
Got my shot string, using 10.5 CPUM, 1450 psi setpoint::
  1 - 10     900, 903, 901, 900, 904, 898, 896, 893, 903, 897
11 - 20     902, ER2, 903, 909, 897, 899, ER2, 901, 896, 896
21 - 30     887, 899, 894, 893, 900, 897, 896, 899, ER2, 894
31 - 40     897, 900, 893, 899, 899, 898, 893, 897, 889, 895
41 - 50     ER2, 898, ER1, 896, 896, 895, 895, 889, 890, 896
51 - 60     889, 894, 894, 899, 896, 894, 897, 897, ER2, 891
61 - 70     897, 894, 897, 888, 893, 890, 900, 900, 893, 890
71 - 80     896, 896, 894, ER2, 893, 894, 900, 896, 898, 898
80 - 90     ER2, 890, 884, 884, ER2, 886, 886, 879, 883, ER2
91 - 95     872, 875, ER2, 863, 861   
"Estimated velocity of 895 fps", which is 18.7 FPE over the first 90 shots = an efficiency of 1.2%
This calculation assumes a 3000 psi fill & 1450 psi end point, which is likely high, but I think I came close or reached my 1.1% goal.
The ES over 90 shots was (909-879)=30  or 30/909=3% ;  ES over first 80 shots was (909-888)=21 or 21/909=2%.
I forgot to lightly oil the (2) .032 belleville washers added to the Ninja regulator, maybe that didn't help the ES? 
Also, bolt blowing back, so o-ring needs to be replaced as do crony batteries
Will have to change bolt o-ring and may open up breach a bit, but probably won't change the probe.  Lastly, will increase hammer preload and sacrifice a few shots to to reach 19 FPE, then done ........... Kirk   
 

[Sfttailrdr46]

  Sounds good congrats on the success story

[Geoff]

looks very nice, good going

[SpiralGroove]

Screwed in the RVA - 1/2 turn and got 912 fps at 3000 psi.  Other than changing bolt o-ring which may yield +5 fps, I'm done .
Kirk