Benjiamin Discovery Chrono results with H&N Baracuda Hunter Extreme 9.26 gr. pellets

[Case Stuffer]

Hand pumped to 2,000 PSI

943 FPS
935
933
930
936 ( Approx.1,800 PSI here)
926
927
924 ( Approx. 1,700PSI here)
919
919

For first 10 shots

930 FPS Avg / 24 Es / 7 Sd


At approx. 1,050 PSI shot # 21 / 833 FPS

Shot # 23 same point of impact at 20 yards as shot # 1.

FWIW These pellets are extremely accurate in my Disco in fact they are the second most accurate of dozen I have tried. Thirty year old Beeman Silver Jet are the most accurate to date.

[melloairman]

Not bad but there is no bell curve . If you had one you would get more shoots per fill . I do not know if you went by the rifle gauge or the pump gauge . But my new 22 Disc gauge is way off . When I fill to 2000 psi by my tank gauge the rifle gauge is 3/4 of the way through the red . But that gives me a good curve and 20 shoots per fill . Try another 100 psi and see what happens . My .177 disc liked cph 10.5 when I had it .Marvin

[Case Stuffer]

My rifle gauge and pump gauges match however rifle only has 1K and 2K lines so between PSIs are approx. . I have a Shoebox Max and Guppy tank with duel gauges ordered so I will have yet another gauge for reference and my guess is the tank gauge on output to rifle will be more accurate than present ones. WIth a tank gauge it should be easy to connect and check rifle PSI at any given point also but maybe not as it depends on how course the gauge reading are..


Post here explains Bell Curve or PSI versus FPS and shot count. best part right below first set of targets.

http://www.pyramydair.com/blog/2008/...r-not-to-glue/

[Case Stuffer]

First post stock hammer spring

Benjamin Discovery Chrono results with H&N Baracuda Hunter Extreme 9.57 gr. pellets

Hand pumped to 2,000 PSI

943 FPS
935
933
930
936 ( Approx.1,800 PSI here)
926
927
924 ( Approx. 1,700PSI here)
919
919

For first 10 shots

930 FPS Avg / 24 Es / 7 Sd


At approx. 1,050 PSI shot # 21 / 833 FPS


************************************************** ************************************************** **************

7-18-15 Cut 3 turns from Hammer Spring added adjustment screw but left backed out.Head of #10 Allen Cap Screw (used as spring pusher and guide)- equals approx. 1-1/2 coils of spring thus same as removing 1-1/2 turns with no adjustment added.
Same 2.0K starting pressure and same pellets

935 FPS
936
936
940
933 - shot # 5
933
936
933
927
924 shot # 10 approx. 1.7K
924
922
914
917
918 shot#15 approx. 1.4K

1-15
Hi 940
Lo 914
Avg 928
ES 26
SD 8

905 shot #16
903 shot #17 down 4% fro Hi
890
886
887 shot # 20 approx 1.3K
1-20 Hi 940
LO 886
919 Av
54ES
17 SD

868
862
855
841
836
820
816 Shot # 27 1.0 K PSI

Results

Stock Hammer Spring

For first 10 shots

930 FPS Avg / 24 Es / 7 Sd

Cut Hammer Spring
First 10 -Avg 933 FPS


First 15

Avg 928
ES 26
SD 8

AVG FPE 18.3


Looks like I could perhaps cut another 1 to 1-1/2 turns off of spring but I will give it some time to settle and re test first.