Huben GK1 maximum rounds so far?

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MrP said:
I just can't stomach purchasing tin after tin of pellets at 18 -23 bucks for 300 or so, and I have to find something I can cast for my daily plinking.

So I cast up a tin full of 50:50 hollow and solid point bbt slugs. These are the .25 50 grain variety. I wish they were lighter but, this is what I have at the moment.

The good news is they are perfect for the magazine. They are the -exact- length of the chambers and they require just a little pressure to seat them so there is no rattling and they stay right where you put them. in this respect you would think they were designed for this gun, and if anyone is looking to shoot something that is around the 48 grain weight (HP is 48, SP is 50) these seem perfect. No jams, and there was no keyholing or anything like that they are clearly flying straight at this distance.


I am not yet testing these in any kind of bench rest situation I mainly shoot this airgun freehand and standing (my favorite way to shoot once I've gotten the gun zeroed in just because of the physical challenge). Shooting this way, I was able to hit a small target from 20 yards as consistently as with pellets, but that doesn't mean much I could've just been lucky with the first magazine.

I wanted these to be a little bit on the larger size so I kept the lead slightly cooler than usual, they all seemed to fill out fine with the pressure pour ladle. This seems to fill out every mold I use it on with minimal mold prep.

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What was your power setting shooting the slugs? I’ve seen where some use a full three turns with heavy slugs.
 
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bernieorosz said:
I'm getting about 28-33 ft/lbs depending pellet, and Power Adjuster setting of 1.5 turns out (ccw). This power level is best for my backyard friendly.

One of the great features of the GK1 is the ability to quickly adjust power levels. The GK1 .22 can be adjusted from around 15 - 45 ft/lbs in under a minute. Take a look at this post of mine for more info on power at different Power Adjuster settings:

Huben pistol.

I've been shooting Apollo 40 grain slugs in mine, set beautifully in it, accurate. That's pretty much only ammo I use in my gk1 now. In another thread here on this forum i saw someone measuring the size of this Apolo slug, and it was .251. So i'm surprised they set in beautifully without moving...
www.airgunnation.com www.airgunnation.com
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A bit late to your post but now that you have had it for a while, if you still have it, hope you don't mind a quick question.

How CONSISTENT is the power relative to the adjustment? Lets say that to make an adjustment, one always tighten the screw to where it stops and has minimum power, and the one turn out 1 1/2 turns, is it always going to consistently be at the same power or is there some randomness so that one has to use the chronograph to get an accurate read of the power again each time the screw is backed out 1 1/2 turns? Thanks.
 
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Ultralight said:
A bit late to your post but now that you have had it for a while, if you still have it, hope you don't mind a quick question.

How CONSISTENT is the power relative to the adjustment? Lets say that to make an adjustment, one always tighten the screw to where it stops and has minimum power, and the one turn out 1 1/2 turns, is it always going to consistently be at the same power or is there some randomness so that one has to use the chronograph to get an accurate read of the power again each time the screw is backed out 1 1/2 turns? Thanks.
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I'm probably not the guy to ask because I was away from shooting for almost 1.5 years due to medical issues. I'm improved now and back to plinking and target shooting.

The GK1 similar to the Huben K1 bullpup was very consistent for me with power levels. The problem is that without clicks or markings, we must 'eyeball' the turns and partial turns, which has the potential to put us off an 1/16-1/18" or more. However, even with that, the 1 1/2 turns out probably won't be more than 1 ft/lbs off or so, if you kept repeating it assuming your outside temperature is consistent.

Plus the other issue, is we must start from all the way in (i.e. zero), and that can be a little off too. If you turn all the way in, it has a little 'give' and no real hard stop, so our starting points could be off a bit too.

In the near future, I plan to retest the GK1 .22 chart I made and posted with various power levels. It will be interesting to see how much has changed, if any, after 1.5 years.
 
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bernieorosz said:
I'm probably not the guy to ask because I was away from shooting for almost 1.5 years due to medical issues. I'm improved now and back to plinking and target shooting.

The GK1 similar to the Huben K1 bullpup was very consistent for me with power levels. The problem is that without clicks or markings, we must 'eyeball' the turns and partial turns, which has the potential to put us off an 1/16-1/18" or more. However, even with that, the 1 1/2 turns out probably won't be more than 1 ft/lbs off or so, if you kept repeating it assuming your outside temperature is consistent.

Plus the other issue, is we must start from all the way in (i.e. zero), and that can be a little off too. If you turn all the way in, it has a little 'give' and no real hard stop, so our starting points could be off a bit too.

In the near future, I plan to retest the GK1 .22 chart I made and posted with various power levels. It will be interesting to see how much has changed, if any, after 1.5 years.
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I am very grateful that you took time to share your knowledge, giving me a short cut to understanding the GK1 - THANK YOU!

Your observation about adjusting power is exactly what I needed to understand. So it is close, but not exact as there are not indexing. This is good enough.

Question: Can you direct me to the charts you posted about the .22? I've searched and only found for .25 caliber GK1. I am most interested to see the charts.

Again, Thank You.
 
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Ultralight said:
I am very grateful that you took time to share your knowledge, giving me a short cut to understanding the GK1 - THANK YOU!

Your observation about adjusting power is exactly what I needed to understand. So it is close, but not exact as there are not indexing. This is good enough.

Question: Can you direct me to the charts you posted about the .22? I've searched and only found for .25 caliber GK1. I am most interested to see the charts.

Again, Thank You.
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I can't find the post either... :). But, here is a snapshot of my Excel spreadsheet with the data.

Huben Gk1 .22 Pistol - Excel Spreadsheet.jpg
 
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Ultralight said:
I am very grateful that you took time to share your knowledge, giving me a short cut to understanding the GK1 - THANK YOU!

Your observation about adjusting power is exactly what I needed to understand. So it is close, but not exact as there are not indexing. This is good enough.

Question: Can you direct me to the charts you posted about the .22? I've searched and only found for .25 caliber GK1. I am most interested to see the charts.

Again, Thank You.
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Actually, I misspoke about the Huben K1 bullpup. It "does" have clicks so you just keep track of how many clicks out. But, it doesn't have physical click markings if I remember correctly.
 
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bernieorosz said:
I can't find the post either... :). But, here is a snapshot of my Excel spreadsheet with the data.

View attachment 557002
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SUPER helpful. I'm surprised how well the .22 hold up against the .25 in efficiency at the higher powers of around 40 ft/lbs. Only a few percentage drop in # of shots I think. At significantly lower power, it looks it then becomes more efficient than the .25. This makes the .22 an 'efficient' option.


It is possible that I'm interpreting the chart wrongly and happy to get input from anyone else who may know. Thanks
 
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