Huben Observations Shooting Huben GK1 V3 - Offhand

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Ezana4CE

Ezana4CE

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Jan 15, 2021
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I’ve been taking more time to shoot my GK1 over the last month or so. My groups aren’t so hot, but are improving some. Today I noticed that after a certain number of shots my pellets were dropping noticeably while shooting from 10 yards. This is without shooting below the recommended 14 12 mpa (I don’t know why I keep confusing 12 mpa with 14 mpa). I would start with the reservoir at 25-26 mpa and after 17 shots the reservoir would finish at 15 mpa. I held over to compensate for the drop and it seems to have corrected the issue. I hadn’t noticed this before and I’m shooting somewhat light pellets At 25.39 grains in .25. I’ll at photos in a little bit once I have a chance to measure some group sizes.

edit: Target #s 3, 4, and 5 were shot 9x with the reservoir “topped off“ around 25-26 mpa. 6, 7, 8 were shot 8x with the second half of the mag ending around 15 mpa. I hadn’t ever noticed a consistent drop in my shots until I shot in an up/down pattern.
IMG_9444.jpeg

The better groups measure around 1.5” CTC Which isn’t great. We’re talking about shooting offhand from 10 yards, BUT I was content seeing 3-5 shots (out of 8-9 shots) grouped tightly on 8 of 11 targets.
 
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Ezana4CE said:
I’ve been taking more time to shoot my GK1 over the last month or so. My groups aren’t so hot, but are improving some. Today I noticed that after a certain number of shots my pellets were dropping noticeably while shooting from 10 yards. This is without shooting below the recommended 14 mpa. I would start with the reservoir at 25-26 mpa and after 17 shots the reservoir would finish at 15 mpa. I held over to compensate for the drop and it seems to have corrected the issue. I hadn’t noticed this before and I’m shooting somewhat light pellets At 25.39 grains in .25. I’ll at photos in a little bit once I have a chance to measure some group sizes.

edit: Target #s 3, 4, and 5 were shot 9x with the reservoir “topped off“ around 25-26 mpa. 6, 7, 8 were shot 8x with the second half of the mag ending around 15 mpa. I hadn’t ever noticed a consistent drop in my shots until I poop in an up/down pattern.
View attachment 574473
The better groups measure around 1.5” CTC Which isn’t great. We’re talking about shooting offhand from 10 yards, BUT I was content seeing 3-5 shots (out of 8-9 shots) grouped tightly on 8 of 11 targets.
Click to expand...
What size are your targets?
 
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steve-l said:
What size are your targets?
Click to expand...
@steve-l On the particular target that I have been using the target sizes vary. The largest is 3” and the smallest is 0.5” in diameter. They are numbered 1-11.
IMG_9323.jpeg

  1. Target 1 is 3”
  2. Target 2 is 2.75”
  3. Target 3 is 2.5”
  4. Target 4 is 2.25”
  5. Target 5 is 2”
  6. Target 6 is 1.75”
  7. Target 7 is 1.5”
  8. Target 8 is 1.25”
  9. Target 9 is 1”
  10. Target 10 is 0.75”
  11. Target 11 is 0.5”
 
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Something else I thought about this morning. Usually before taking a shot, my index finger is outside of the trigger guard until I am ready to shoot. When shooting rifles, inserting it when I'm ready to take a shot causes very little noticeable movement as I view the target through the rifle scope. Shooting the GK1 air pistol, that same motion causes considerable movement taking my sight off target while viewing my target through the reflex sight. With long fingers I cannot see any way around this. Anyone have any suggestions to cut down on my moving the gun as I prepare to take a shot?
 
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Ultralight said:
Practice dry firing. No pellets. Isolate your trigger finger from the rest of the muscle groups.

BUT I don't know if it is safe for the GK1 to dry fire a lot.
Click to expand...
No issue dry firing Gk1. Unlike the K1 it uses more air for dry firing and is louder for dry fire. Stay on top of your pressure so you don't go below minimum.
 
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Ultralight said:
Practice dry firing. No pellets. Isolate your trigger finger from the rest of the muscle groups.

BUT I don't know if it is safe for the GK1 to dry fire a lot.
Click to expand...
Not a bad suggestion, but no need to waste air or run the action. I think I may practice more by leaving the safety on and going through the motions. I don't need to shoot, only to touch the trigger. I would like to learn to get my finger within the trigger guard without a lot of movement. It seems so much easier to do with a rifle.

@Ultralight How do your groups look shooting the GK1 in pistol configuration?
 
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Ezana4CE said:
Not a bad suggestion, but no need to waste air or run the action. I think I may practice more by leaving the safety on and going through the motions. I don't need to shoot, only to touch the trigger. I would like to learn to get my finger within the trigger guard without a lot of movement. It seems so much easier to do with a rifle.

@Ultralight How do your groups look shooting the GK1 in pistol configuration?
Click to expand...
I don't shoot in pistol config. Only Carbine.

I think what you need is to have confidence that your gun is grouping normally so the only way to do this is to put it on a proper rest, super stable, and shoot at string. At 10 meters that you shoot,you should have virtually hole in one, shot after shot with the right pellets and speed.

So there are two components:
1. Your GK1's precision.
2.Your technique as a shooter.

I personally would seek to answer #1 first so that I have confidence that any inaccuracy is due to my own technique.
 
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Ultralight said:
I don't shoot in pistol config. Only Carbine.

I think what you need is to have confidence that your gun is grouping normally so the only way to do this is to put it on a proper rest, super stable, and shoot at string. At 10 meters that you shoot,you should have virtually hole in one, shot after shot with the right pellets and speed.

So there are two components:
1. Your GK1's precision.
2.Your technique as a shooter.

I personally would seek to answer #1 first so that I have confidence that any inaccuracy is due to my own technique.
Click to expand...
@Ultralight What are you talking about? As far as I can tell I am a the problem. That’s not even a question. This is why I’m asking for advice. I pay attention to experienced shooters. I don’t think I have seen a group that you’ve posted. If you don‘a shoot your GK1 pistol in pistol configuration, what qualifies you to have so much to say to me if or when I’m asking for advice?
 
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Ultralight said:
I see. I misunderstood. Thanks for clarifying. I won't trouble you with ruther non-useful comments. Glad that you clarified.
Click to expand...
@Ultralight I didn’t ask as a way of saying “shut up.” I asked because I don’t know you and know little about you. I have no idea how you shoot or what you’re capable of. Unless you have had other user names, you haven’t been around here long as far as I can tell. You may be some sort of pistol expert and I don’t know what you know. Conversely, you may also be an 18 year-old young man who is really enthusiastic about air guns and post a lot out of excitement. Either way is fine until I cannot make sense of what you’re talking about or what you’re saying has little use to me. So far you have two posts in this thread that left me scratching my head.
 
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This is some sort of LOP issue, I guess there is a LOP involved with pistols. It appears that I could benefit from a fatter grip. Thank you to @AirNGasman for helping me flesh out the significant factors.

Can anyone tell me who sells varied grips for the GK1? I would prefer a wood grip if possible.
 
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No advise here, But I practice with a quick shot,, Red dot on all pistols,, I do not draw from a holster,, I just hold the gun down at side come up and shoot, Just see how fast I can get the dot on target and shoot..
10 yards -20 yards and 30 yards , cans , pill bottles and large gallon plastic cans at 30 yards , Sighting in I do use a paper target at 10 yards..
Raining here or I would run out and get some pictures, It do rain in the desert , sometimes...
GKI shorty 25 - Kool special
PP 750-22- 10 inch barrel, huma reg,
PP 700-22- all OEM
Reximex -22,
Mike
 
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@airgunmike56 I practice as I would use my airguns for purposes I purchased them. I sometimes wear my GK1 holstered while tending to smaller livestock because im shooting at what even lest within 50 yards. When I pull out of the holster I’m ready to shoot so I practice that way. it’s starting to come to me like a reflex. When my arms and shoulders aren’t tired I can get on target relatively quick. I’m getting a feel for my holster, it’s not a bad fit. I’d change little about it for what it is as I see it in my experience so far.

What do you mean by “I practice with a quick shot?” is this a device or your style of shooting?
 
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Ezana4CE said:
I’ve been taking more time to shoot my GK1 over the last month or so. My groups aren’t so hot, but are improving some. Today I noticed that after a certain number of shots my pellets were dropping noticeably while shooting from 10 yards. This is without shooting below the recommended 14 12 mpa (I don’t know why I keep confusing 12 mpa with 14 mpa). I would start with the reservoir at 25-26 mpa and after 17 shots the reservoir would finish at 15 mpa. I held over to compensate for the drop and it seems to have corrected the issue. I hadn’t noticed this before and I’m shooting somewhat light pellets At 25.39 grains in .25. I’ll at photos in a little bit once I have a chance to measure some group sizes.

edit: Target #s 3, 4, and 5 were shot 9x with the reservoir “topped off“ around 25-26 mpa. 6, 7, 8 were shot 8x with the second half of the mag ending around 15 mpa. I hadn’t ever noticed a consistent drop in my shots until I shot in an up/down pattern.
View attachment 574473
The better groups measure around 1.5” CTC Which isn’t great. We’re talking about shooting offhand from 10 yards, BUT I was content seeing 3-5 shots (out of 8-9 shots) grouped tightly on 8 of 11 targets.
Click to expand...
It seems that this pronounced pellet drop is occurring as the reservoir is shot down below the minimum threshold for its sweet spot. It shoots pretty flat around 911-919 fps (approx 47 FPE) from a 25-26 mpa fill. There appears to be about a 20 fps drop in velocity below 911 fps then each shot appears to lose 9-12 fps for 8-9 more shots if I continue to shoot and push the pistol towards 13 mp. Below that it will dump air until about 9 mpa is left in the reservoir.
IMG_9452.jpeg
 
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Ezana4CE said:
It seems that this pronounced pellet drop is occurring as the reservoir is shot down below the minimum threshold for its sweet spot. It shoots pretty flat around 911-919 fps (approx 47 FPE) from a 25-26 mpa fill. There appears to be about a 20 fps drop in velocity below 911 fps then each shot appears to lose 9-12 fps for 8-9 more shots if I continue to shoot and push the pistol towards 13 mp. Below that it will dump air until about 9 mpa is left in the reservoir.
View attachment 574740
Click to expand...
Will have to check my velocity. Shot my shorty this weekend was getting solid 3 mags .25 cal 25 grain hades. Thought it was shooting around 800 fps. 4800 psi fill.
 
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