Here are the results with my Wildcat Compact. On it I have a Hawke Sidewinder 6.5-20x42 with Hawke Match High Rings that puts the sight Height 2.5" above the centerline of the barrel. I am also using at Atlas BT46-LW17 Bipod and a small shooting bag to help support for zero.
Using Chairgun Pro with the JSB 25.39, FPS of 875, Kill-zone of 0.60", I get the optimum zero range of 42.1 yards. I zeroed in and I then did another 3 rounds of 8 and got groups of 1" around the target (all 1/2" from the X of the target). I do not recall the starting or ending pressure.
I pumped it up to 230 bar. Previously I was stopping around 225 bar. The first round of 8 shots was low and to the left a 2.25" group around 1.5" low and 1.5" to the left. This group started at 230 bar. I then did another round of 8 and hit dead center with a 3/4" group. Starting pressure was around 195 to 200 bar. Photo of target is below.
I am wondering if 230 is too much. Looking at my chrono results in the previous post, the sweet spot is around 145 to 200. Not sure why that first round of 8 was off. I did not do a third since I had to pack up but will test more next weekend.
Created: 05-06-2018 01:31:43 PM
Description: FX Wildcat JSB 25.39
Notes 1: JSB 25.39
Notes 2:
Distance to Chrono (FT): 0.75
Ballistic Coefficient: 0.036
Bullet Weight (gr): 25.390
Altitude (FT): 0.0
Temp: N/A
BP: N/A
Shots
# FPS FT-LBS PF Bar
36 848 40.55 21.53 130
35 857 41.41 21.76 135
34 858 41.51 21.78 135
33 866 42.29 21.99 140
32 867 42.39 22.01 140
31 874 43.07 22.19 145
30 876 43.27 22.24 145
29 877 43.37 22.27 150
28 884 44.06 22.44 150
27 879 43.57 22.32 150
26 880 43.67 22.34 155
25 883 43.96 22.42 160
24 884 44.06 22.44 160
23 885 44.16 22.47 165
22 883 43.96 22.42 170
21 882 43.86 22.39 170
20 884 44.06 22.44 170
19 882 43.86 22.39 175
18 877 43.37 22.27 180
17 877 43.37 22.27 180
16 881 43.77 22.37 180
15 883 43.96 22.42 185
14 880 43.67 22.34 190
13 873 42.97 22.17 195
12 878 43.47 22.29 195
11 871 42.78 22.11 200
10 877 43.37 22.27 200
09 874 43.07 22.19 200
09 870 42.68 22.09 205
07 881 43.77 22.37 210
06 871 42.78 22.11 210
05 864 42.09 21.94 215
04 863 42.00 21.91 220
03 863 42.00 21.91 220
02 851 40.84 21.61 225
01 814 37.36 20.67 225
Average: 872.14
StdDev: 13.90
Min: 814
Max: 885
Spread: 71
True MV: 874.20
Shots/sec: 0.03
Group Size (IN): 0.00