Here is an other spin off thread for the Huben pistol where members can share what ammo they have found works good,....... or bad in their hand cannon.
Huben Huben pistol ammo choice.
- Thread starter Nomadic Pirate 66
- Start date
If you have a 25 it’s very easy to make a small cerrosafe cast on top of a silicone plug and then shoot it out (at low power) into a towel.
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I'm always slugging my barrels, either by pushing slugs through with a rod or shooting them at low power into ballistic gel. I'm going to shoot the .25 at low power this week to get a definitive answer if no one has responded yet.
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I have a precision set of pin gauges and I have measured my GK1 .25 Cal. barrel. There is no choke. It is .247" Go and .248" No Go at both ends. It has a 1 in 16 rifling rate. My magazine chamber bores are .250" Go and .251" No Go.
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I am not certain but like many others I have had the best results with .254 diameter ammo in the .25 rifle. I haven't tried anything other than .254 in my pistol. Tried to have a .2537 die made and Corbin screwed it up. Not sure if they're going to make it right or not yet, no response so far.
What a fortunate coincidence that the .22 ammo I make is exactly .2225. I guess it isn't that fortunate. I did have Corbin attempt to replicate the dimensions of the original huben slugs
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While the gun was disassembled, I measured everything and cleaned the barrel. It was very dirty. I cannot say it came that way, I simply don't know, but I only fired about 1,000 pellets. Disassembling the gun is easy, so cleaning the barrel that way is a non problem. Here is a tip. I made the mistake of thinking both sides of the magazine are the same. They are not. The back side(where you load the pellets) has a very small chamfer. Make sure that is facing rearward when you reassemble.
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No one was insisting here my friend..i clearly stated i was going with .253 and .254,i just said supposedly the 44gr heavies were working as suggested by one of the huben dealers (who hopefully would have tested them beforehand).so if you have a tin hanging around you can give them a shot as i will do and let everyone know
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I don't think you are measuring correctly. Those calipers are incapable of reaching to the bottom of the grooves. They are too thick.
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I was referring to your keenness to try it, not implying that you insist that they are accurate. I appreciate your willingness to post the results, because I haven’t seen any pictures of groups.No one was insisting here my friend..i clearly stated i was going with .253 and .254,i just said supposedly the 44gr heavies were working as suggested by one of the huben dealers (who hopefully would have tested them beforehand).so if you have a tin hanging around you can give them a shot as i will do and let everyone know
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The diameter of a slug with an air gun is critical because without drive bands, the potential of excessive bore resistance is high if the slug diameter is greater than the groove diameter of the barrel. Based on my measurements, which admittingly only measure the land diameter (barrel minimum) and eyeballing the the barrel, those rifling lands are no more than about .003" tall. which is plenty to grip the slug. I would not entertain a slug diameter greater than .253" max (.247 + .006").No one was insisting here my friend..i clearly stated i was going with .253 and .254,i just said supposedly the 44gr heavies were working as suggested by one of the huben dealers (who hopefully would have tested them beforehand).so if you have a tin hanging around you can give them a shot as i will do and let everyone know
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I will try to find time to cast my 25 K1 for comparison with the data from the pistol. I do know that its barrel has a much smaller number of lands and grooves than the .22. How many are there on the pistol barrel?
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So you would rule out the .254’s is essentially what you are saying?stephen at AVS (who has a K-1) said he would suggest 40/42gr .254 flat base as top choice..the only suitable .253 i can think of off hand is ZAN i think
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I have some 38.5gr here.my gk1 gets here today so hopefully i’ll let you know tomorrow how they run
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Here is the thing, my barrel may be slightly different than yours. My advice is only valid if our barrels are the same size. The correct answer for you is to suck it and see. A good clue would be a drop in velocity, which would happen if the drag increased. I would establish a baseline with a .250/.251 slug, Accuracy would not matter here, just speed. Then shoot progressively larger slugs until you see a slowing in speed. Then back off .001" from that and that would be your correct diameter. Now look for accuracy. I think the GK1 will like the heavier ammo because of the 1-16 twist.
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I did not count, but I think 6. The barrel OD is 12 mm and the barrel was button rifled, not swaged.
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