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Zbroia Kozak 177 arrived today
- Thread starter shutik
- Start date
I agree with you, some think that just twisting the HS they will get the best of their guns, I haven't touch anything on my yet as I am concentrating on muzzle crack, after I sort this, then I will tune for fps and shot count, my at a moment is giving 40/45 per fill which I know it can do better than that.
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53 ft is only 16.m (+/-) that will be a 1 hole group a bet.
40 degrees? that's freezing, down here in Cape Town today was + 33 c, it's a bit cooler now.
40 degrees? that's freezing, down here in Cape Town today was + 33 c, it's a bit cooler now.
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Personally I would fill the gun and shoot 10 shots, recording the velocity. I would then increase HS 1/2 turn and shoot 5 more and record. Keep increasing HS and shooting 5 shots until you see NO increase in FPS. Then back it off 1/4 to 1/2 turn.
Here is an example of what you should see.
As is - 850,850, 855, 850, 845, 850, 848, 855, 848, 849
1/2 turn in - 870, 872, 870, 872, 871
1 turn in - 890, 890, 892, 888, 887
1.5 turns in - 900, 901, 904, 900, 901
2 turns in - 905, 905, 904, 902, 904
2.5 turns in - 905, 905, 903, 900, 906
I would then set this gun at about the "1 turn" setting. This will basically give you your highest power at the best efficiency (for that power) If the 890-892 FPS is less then you desire then you would need to do additional "tuning" my raising the regulator pressure. IF you wanted lower then you could also just turn the HS back, or likely make your ES and SD smaller by turning the regulator down.
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Ramjet,
Based on the picture I believe yours is short version 22 with 180cc tube and 13.8 inch barrel.
I'm attaching long version, so you can see difference yourself, tube and barrel sticking out much longer distance past stock end.
I don't think 30J claim is accurate, since chrono results show 39J. Last 2 shots look to be coming off reg.
I would still do what BigTin advised with spring. Just remember to take out grub screw before adjusting spring tension and keep the action out of the stock.
Based on the picture I believe yours is short version 22 with 180cc tube and 13.8 inch barrel.
I'm attaching long version, so you can see difference yourself, tube and barrel sticking out much longer distance past stock end.
I don't think 30J claim is accurate, since chrono results show 39J. Last 2 shots look to be coming off reg.
I would still do what BigTin advised with spring. Just remember to take out grub screw before adjusting spring tension and keep the action out of the stock.
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"shutik"Ramjet,
Based on the picture I believe yours is short version 22 with 180cc tube and 13.8 inch barrel.
I'm attaching long version, so you can see difference yourself, tube and barrel sticking out much longer distance past stock end.
I don't think 30J claim is accurate, since chrono results show 39J. Last 2 shots look to be coming off reg.
I would still do what BigTin advised with spring. Just remember to take out grub screw before adjusting spring tension and keep the action out of the stock. ......Shutik, that is what I was concerned about ,(receiving the short version) I guess it is what it is, can't do much about it now, thank you
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Now if this is a "Short 30j" version that has been turned up already then increasing the HS will likely only waste air. If when turning it in you don't see any increase then you will want to turn it out (and shoot between) until you see the FPS dropping.
Basically you want to tune the HS tension so that you are shooting about 95-98% of max velocity at your current regulator setting. If you crank the HS in all the way and get a MAX velocity of 900, then (for better efficiency) you want to have your HS set to where you are getting 850-875fps.
If you find that the 851 is the MAX you can get, then you will want (for better efficiency) to set the HS to where you are getting 810-830fps. Of course you can leave it at 850 if you want but the difference could be 25 shots at 850 vs 45 shots at 830. You won't know till you try it.
Basically you want to tune the HS tension so that you are shooting about 95-98% of max velocity at your current regulator setting. If you crank the HS in all the way and get a MAX velocity of 900, then (for better efficiency) you want to have your HS set to where you are getting 850-875fps.
If you find that the 851 is the MAX you can get, then you will want (for better efficiency) to set the HS to where you are getting 810-830fps. Of course you can leave it at 850 if you want but the difference could be 25 shots at 850 vs 45 shots at 830. You won't know till you try it.
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That's is strange, as I was under the impression that only 2 versions were out, as per the link that I posted, whether on the disciptions says, 22.5j, 30j and 44j but the pics shows only 2 rifles (4 for the 2 different colours), .177 cal and .22 cal, the 330mm barrel in wood and the other in grey, the 450mm the same, only other rifle that I know from them is the Hortitia, which is a standard lenght rifle, I ddin't know there was a 180cc, 330mm in .22 cal, even on the ad vids on youtube, they don't show that. Maybe bad discription from their side?, Or bad website build?. That's why I was/am so kin on the .177 cal, shorter and smaller than 1 I have in .22 cal. I will speak to my supplier again and find out.
BigTin is right, best fps for that barrel lenght would be max of 860/875 and that is pushing for a 330mm barrel, also Jsb's 18.13, perform better @ these speeds, so I believe.
No wonder I was a bit confused about short and long versions that keeps coming up.
BigTin is right, best fps for that barrel lenght would be max of 860/875 and that is pushing for a 330mm barrel, also Jsb's 18.13, perform better @ these speeds, so I believe.
No wonder I was a bit confused about short and long versions that keeps coming up.
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Also that means that we can buy the shorter/longer barrel and the smaller/bigger air reservoir?!!? for the .22 cal??!!?
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Airgunmonkey,
There are 4 versions, 177 short and long and 22 short and long.
Difference in energy is due to barrel length only, all other internals are the same.
Hortitsia is another model with traditional rifle stock that also has 4 versions: 177 short and long and 22 short and long.
Tubes are interchangeable between all versions. Regulator, plenum and valve are all inside the tube.
There are 4 versions, 177 short and long and 22 short and long.
Difference in energy is due to barrel length only, all other internals are the same.
Hortitsia is another model with traditional rifle stock that also has 4 versions: 177 short and long and 22 short and long.
Tubes are interchangeable between all versions. Regulator, plenum and valve are all inside the tube.
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Thanks for clarifying that, which gets better and better, so I think, will speak to supplier then get a shorter barrel for .22 and a .177 barrel and a smaller tube too.
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thanks again AGM . Bigtin & Shutik for all the info, the package is on its way from Nashville since 1;30 am , so it is on time , should be here tommorow, I am going to drive to the UPS store 45 miles round trip , instead of waiting for the truck, I am a very impatient guy, roger
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Not sure about barrel attachment, but since the reservoir just "threads" in I'd imagine that would be a VERY simple switch.
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I thought about that ramjet66, have to consider the mag, pellet load probe as well, as they're differ from the .22 cal, I contacted my supplier today and just waiting for his reply, maybe I just get the 330mm barrel in .22 cal and the smaller air tube in case cannot switch to .177.....but would be awesome if we could, like the FX's and the Priest, let's see.
I am glad that yours it's on it's way. Been shooting my, as we speak, bro, I like it more and more, I made a mock up adaptor for a LDC and now I can shoot @ my backyard, it's not permanently, just to see if I could quiet it down, it works, I would say 6/10.
I am glad that yours it's on it's way. Been shooting my, as we speak, bro, I like it more and more, I made a mock up adaptor for a LDC and now I can shoot @ my backyard, it's not permanently, just to see if I could quiet it down, it works, I would say 6/10.
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