Initial shot string data from the newly released Hatsan Bully 25 cal

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Rich7777

Rich7777

Member
Jan 14, 2018
111
3
IN
Got the newly released Hatsan Bully 0.25cal from Dennis at IndianaAirguns.com. At the time, they didn't have the Bully listed so I called him and he ordered it. Their website is a work in progress, but Dennis is a pleasure to deal with. I got the Hatsan Bully a few days later. Spent Thurs. and Fri. evenings cleaning the barrel and mounting a scope, On Sat., I went out to their airgun range for a day of shooting. I was able to get the sidewinder scope sighted in and ran different pellets over my chrono. At 250 bar, this thing is HOT. The shot curves are declining flat lines. I think a hammer spring tweak will settle it down into a nice shot curve. I'm looking forward to playing with it.

200+ shots later, here's the data:

Pellet - JSB Match Diabolo Exact King 25.39gr
Shot Count - 39 (3 full mags)
HI - 1115
LOW - 811
AVG - 991
ES - 304
SD - 89.9

Pellet - JSB Diabolo Exact King Heavy 33.95gr
Shot Count - 39 (3 full mags)
HI - 1017
LOW - 702
AVG - 897
ES - 315
SD - 97

Pellet - JSB Diabolo Exact King Heavy 33.95gr
Shot Count - 39 (3 full mags)
HI - 1016
LOW - 713
AVG - 899
ES - 303
SD - 88.6

Pellet - Eun Jin Pointed 43.2gr
Shot Count - 39 (3 full mags)
HI - 938
LOW - 640
AVG - 826
ES - 298
SD - 91.48

Pellet - H&N Baracuda Green 19.91gr
Shot Count - 39 (3 full mags)
HI - 1171
LOW - 781
AVG - 1017
ES - 390
SD - 116.28

There's a lot to like about this bullpup. More to come.

 
Let's see if I can get a graph to post
1524446980_8127864335add3704e83937.10421433_Hatsan_Bully_25cal_1st_shot_strings_graph.png


download.png
1524447379_5055098875add389329da59.21505826_Hatsan_Bully_25cal_1st_shot_strings_graph.png


EDIT: That's a bit hard to see so I attached the photo.
 
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"Seth0764"Great info. Thank you for taking the time to post. I am interested in this one. Can you tell me the SD and ES for the first magazine?


Click to expand...

I think I've got this calculated right. Based on first 13 shots for each shot string. Not sure what's going on with the heavy's. Shot 2 strings of them. Might be on my end or just a new gun settling in.

Pellet - ES - SD
JSB Match Diabolo Exact King 25.39gr - 66 - 19.8
JSB Diabolo Exact King Heavy 33.95gr - 44 - 11
JSB Diabolo Exact King Heavy 33.95gr - 59 - 16
Eun Jin Pointed 43.2gr - 44 - 11.6
H&N Baracuda Green 19.91gr - 73 - 22.3
 
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Still playing with the data. Here's the average FPE per shot string per mag

String 1 - Mag 1 - JSB Match Diabolo Exact King 25.39gr - Avg FPE = 66.7
String 1 - Mag 2 - JSB Match Diabolo Exact King 25.39gr - Avg FPE = 56.5
String 1 - Mag 3 - JSB Match Diabolo Exact King 25.39gr - Avg FPE = 44.2

String 2 - Mag 1 - JSB Diabolo Exact King Heavy 33.95gr - Avg FPE = 75.3
String 2 - Mag 2 - JSB Diabolo Exact King Heavy 33.95gr - Avg FPE = 62.9
String 2 - Mag 3 - JSB Diabolo Exact King Heavy 33.95gr - Avg FPE = 46.1

String 3 - Mag 1 - JSB Diabolo Exact King Heavy 33.95gr - Avg FPE = 74.4
String 3 - Mag 2 - JSB Diabolo Exact King Heavy 33.95gr - Avg FPE = 62.5
String 3 - Mag 3 - JSB Diabolo Exact King Heavy 33.95gr - Avg FPE = 47.7

String 4 - Mag 1 - Eun Jin Pointed 43.2gr - Avg FPE = 81.6
String 4 - Mag 2 - Eun Jin Pointed 43.2gr - Avg FPE = 67.8
String 4 - Mag 3 - Eun Jin Pointed 43.2gr - Avg FPE = 49.4

String 5 - Mag 1 - H&N Baracuda Green 19.91gr - Avg FPE = 57.3
String 5 - Mag 2 - H&N Baracuda Green 19.91gr - Avg FPE = 47.5
String 5 - Mag 3 - H&N Baracuda Green 19.91gr - Avg FPE = 34.2
 
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Before I do anything, I'm going to see how bullets perform. Once I'm done getting baseline data, I'll start working on the hammer spring until I get the desired velocity for the pellet I want to tune for. Backing the speed down should create more of a shot curve than a flat line. This should improve accuracy a lot. At this point, it's shooting way to hot for pellets. I'll start with the hammer spring, then possibly adjust the valve spring. 
 
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