Gauntlet Shot String Critique

[bnt55]

Installed tune kit from Jefferson State Air Rifles on my Gauntlet, the regulator is set to 1250 psi and I am shooting 14.3 CHPD.  The first couple of shots I was adjusting hammer spring load to get to 820 fps, but I noticed in the middle of the string the fps went up into the 850's then back down?  I do think I have a very slight leak at the new poppet which I will be addressing this coming week.

My goal is accuracy and shot count.  I will be hunting starlings at around 45 yards and would really like to use my JSB 18.13 pellets since they are so accurate.  Any tips would be greatly appreciated

Description: umarex gauntlet after JSAR tune
Notes 1: Crosman 14.3
Notes 2: Regulator set to 1250 psi
Distance to Chrono (FT): 0.00
Ballistic Coefficient: 1.000
Bullet Weight (gr): 14.300
Altitude (FT): 0.0
Temp: 66 °F
BP: 30.06 inHG
Shots
#     FPS        FT-LBS     PF
88    799        20.27      11.43     
87    802        20.43      11.47     
86    806        20.63      11.53     
85    812        20.94      11.61     
84    822        21.46      11.75     
83    828        21.77      11.84     
82    828        21.77      11.84     
81    836        22.20      11.95     
80    839        22.36      12.00     
79    841        22.46      12.03     
78    846        22.73      12.10     
77    851        23.00      12.17     
76    855        23.22      12.23     
75    855        23.22      12.23     
74    855        23.22      12.23     
73    853        23.11      12.20     
72    854        23.16      12.21     
71    852        23.05      12.18     
70    855        23.22      12.23     
69    853        23.11      12.20     
68    846        22.73      12.10     
67    849        22.89      12.14     
66    840        22.41      12.01     
65    833        22.04      11.91     
64    833        22.04      11.91     
63    833        22.04      11.91     
62    833        22.04      11.91     
61    832        21.98      11.90     
60    826        21.67      11.81     
59    829        21.83      11.85     
58    833        22.04      11.91     
57    829        21.83      11.85     
56    826        21.67      11.81     
55    825        21.62      11.80     
54    823        21.51      11.77     
53    828        21.77      11.84     
52    824        21.56      11.78     
51    825        21.62      11.80     
50    829        21.83      11.85     
49    818        21.25      11.70     
48    833        22.04      11.91     
47    827        21.72      11.83     
46    829        21.83      11.85     
45    831        21.93      11.88     
44    826        21.67      11.81     
43    830        21.88      11.87     
42    818        21.25      11.70     
41    826        21.67      11.81     
40    823        21.51      11.77     
39    818        21.25      11.70     
38    826        21.67      11.81     
37    824        21.56      11.78     
36    827        21.72      11.83     
35    825        21.62      11.80     
34    823        21.51      11.77     
33    824        21.56      11.78     
32    820        21.35      11.73     
31    825        21.62      11.80     
30    824        21.56      11.78     
29    831        21.93      11.88     
28    825        21.62      11.80     
27    831        21.93      11.88     
26    833        22.04      11.91     
25    830        21.88      11.87     
24    828        21.77      11.84     
23    829        21.83      11.85     
22    832        21.98      11.90     
21    824        21.56      11.78     
20    822        21.46      11.75     
19    829        21.83      11.85     
18    830        21.88      11.87     
17    823        21.51      11.77     
16    819        21.30      11.71     
15    829        21.83      11.85     
14    828        21.77      11.84     
13    822        21.46      11.75     
12    815        21.09      11.65     
11    822        21.46      11.75     
10    817        21.20      11.68     
9     825        21.62      11.80     
8     816        21.15      11.67     
7     824        21.56      11.78     
6     826        21.67      11.81     
5     822        21.46      11.75     
4     831        21.93      11.88     
3     820        21.35      11.73     
2     838        22.30      11.98     
1     853        23.11      12.20     
Average: 829.65
StdDev: 11.71
Min: 799
Max: 855
Spread: 56
True MV: 829.65
Shots/sec: 0.07
Group Size (IN): 0.00

[Geoff]

looks good to me for hunting, at ~ 6.5% ES it may not be up to FT or benchrest contests though i dont shoot either so cannot be certain.   I just recall seeing "4%" as the number to shoot for if one was punching paper.   Since you are hunting, .25" or less, probably less, is not likely to matter.

string looks nice to me and unless you want to tinker, call it done and go toss lead.   

[only1harry]

That string doesn't look bad at all, except when the velocity starts climbing.  Just try to figure out the POI change from ~820fps to 850fps because that 30fps will make a difference at 45 yards.  88 shots is great though.

I shoot the JSB 15.89 Jumbos in my stock Gauntlet.  It liked this pellet the best.  My shot string is much tighter than yours for 40 shots with an 9fps maximum spread, but most shots are only about 3, 4fps apart, and SD was 2.8 I think.  Avg. was 801fps, 22.6fpe.  I usually take 60-65 shots before refilling, and the POI does not change.  I just didn't want to waste all my JSB pellets on the Chrono and stopped at 40 shots because I am down to 1/4 tin of the 15.89's.  I don't see the need to upgrade it or tune it since the factory regulator on mine is doing a great job.  The gun is a tack driver at 25 yards - same hole usually or small ragged hole.  I have not shot it at longer distances yet but I suspect 1/2" at 40-45yds with 5-10mph wind.  Took 18 Starlings with it this winter.

Harry 

[bnt55]

I'll probably tinker with it a little bit to fine tune things. I usually hunt with jsb 18 grain but I might look at the 15 gr pellets to keep my fps close to the Crosman. Thanks for the replies

[holmegaard]

Northern Kentucky starlings should be very afraid 

[bnt55]

Northern Kentucky starlings should be very afraid 

Good to see another northern kentuckian, I was wondering the rest of us were 

[holmegaard]

Was beginning to think there were no others!  Lots of bewildered looks & comments whenever I show up with an airgun at any of the local ranges.

[jarmstrong]

Your gun will shoot 23.22 ft/lb at that reg pressure, you could lower your reg pressure or increase hammer spring for a flatter string
normally people adjust the hammer spring till they reach the max velocity for the reg pressure for a low ES

[oldpro]

 i agree your tuned well below the knee therefore when you come off the regulator your seeing big gains in FPS. I would lower the reg pressure or turn the adjuster in 1+ turns

[KnifeMaker]

Same in Texas Guy's. Strange look when I show up with pcp. 

Have won a few bucks from the ar shooters that make fun of it.

The .257 kicks their butts at the 100 targets every time. LOL

Knife