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Auckland Based Air Gunner
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BushSpirit View Drop Down
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Joined: 21 Apr 2022
Location: Auckland
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Posts: 9 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BushSpirit Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2022 at 5:22pm
Evening All
To answer jwabfrog regarding the tuning.
*High polished piston cylinder 
*High polished piston body
*Drilled out transfer port (4.5mm)
Regarding the high fps, I have had three readings of of crazy high fps.1840 / 1723 / 1630.
After further investigations, I am putting it down to residual oil / grease in the piston chamber, so this shows you just the effect of dieseling.
Saying all of that, I am still blown away with the consistently high fps increase I have managed to get from the pretty basic tuning done to this rifle.
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dvlnme View Drop Down
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Joined: 30 May 2017
Location: taranaki
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Posts: 519 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dvlnme Quote  Post ReplyReply Direct Link To This Post Posted: 29 May 2022 at 7:40am
i would be interested to know as well just how you managed to get 1800plus from that rifle as nunga said thats 100fpe and rimfire territory,i have owned 22 pcps that put out 100plus fpe with 40gr lead bullets and there are a few 22 cal pcps that can doso today,but have never heard of gas ram rifle being capable of doing so before,not saying cant be done,just never heard of anyone doing so before,so like nunga would be interested in how you did so.
 cheers mike
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nunga View Drop Down
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Joined: 08 Mar 2013
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Posts: 1012 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nunga Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 9:23am
Yeah I would like to know what kind of tuning did you do for that kind of power as well. as they are rated at 1250 fps with alloy pellets which are super light. makes it hard to believe 1840 with 14.3 gr pellets. Most PCPS cant do that. thats over 100 foot pounds. thats .22 rimfire power.
2nd place HP springer - WFTF World Championships 2014
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jwabfrog View Drop Down
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Joined: 12 Nov 2021
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Posts: 142 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jwabfrog Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2022 at 2:54pm
What sort of tuning did you do to get 1840fps!!!!? 
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BushSpirit View Drop Down
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Joined: 21 Apr 2022
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Posts: 9 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BushSpirit Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2022 at 9:12am
Good Morning mercs
It certainly appears I have a bias to the .22 calibre and I have now just purchased a Crosman 2250b
as a project gun.
I have placed my orders on GMAC in the UK for so many parts Confused but its going to be fun.

I have finished the upgrading of the Crosman 1322 and man it is awesome, so quiet with its new silencer from Youngs Airguns and with the new GMAC flat top valve kit installed, its pushing a 14.3 gr Crosman Premier Hollow Point to nearly 700FPS, very happy with that.

I have also tuned and modified the GAMO Magnum and it maxed out with the same 14.3 gr hollow point at 1840FPS which is just nuts, made a hell of a crack. I am now only running heavier 25.39gr JSB Exact Jumbo Monster's to slow things up to around 950-960FPS. I may even try the H&N 30gr Slugs and see how they perform.

Anyway, I will give updates on the new project gun as it progresses. 

Stay well. 
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mercs View Drop Down
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Joined: 24 Apr 2020
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Posts: 272 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mercs Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2022 at 9:11pm
Welcome from Stratford, pest control a great help for native species so good hunting.
I see by your rifle choices a solid bias towards .22

cheers for now

I have the earlier Gamo Magnum Replay 10 and use the H&N 1.2 gramme Barracuda Hunter Extreme pellets.

GamoMagnum replay .22
Pellet BrandH&N
Pellet typeBHE
Average fps816
Grains19.09
Grammes1.21
foot pounds28.23
Joules38.28
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BushSpirit View Drop Down
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Joined: 21 Apr 2022
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Posts: 9 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BushSpirit Quote  Post ReplyReply Direct Link To This Post Posted: 28 Apr 2022 at 8:55am
Yip, and its held up to the face, Shocked
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Joined: 20 Apr 2022
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Posts: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote joeboy Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2022 at 2:47pm
I saw on youtube 4000psi getting put into a large pcp rifle. You would want to have decent fittings at that pressure, pretty dangerous.


Edited by joeboy - 22 Apr 2022 at 2:49pm
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BushSpirit View Drop Down
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Posts: 9 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BushSpirit Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2022 at 11:19am
Mike, thanks for response. 
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dvlnme View Drop Down
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Posts: 519 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dvlnme Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2022 at 7:34am
airguns today have become very sophisicated,they very different to airguns 20/30 years ago,the really good ones are fully the eqaul in accurracy to match grade firearms,with the possible exception of chamois and tarr there is nothing in nz you cant effectively hunt with some form of airgun,if target shootings your interest,its just as hard and fun with airguns as it is with firearms,airguns can be legally shot in your back yard as long as its safe and dosnt annoy your neighbours if in town,there is a lot airguns can be used for that you cant do with firearms safely or legally and for those who like tinkering with their guns there is a lot you can do to improve,modify,customise,or evan build with airguns today,plenty to keep you intersted and busy as we today live in the golden age of airguns because airguns have come of age as a serious form of hunting and target shooting gun,welcome to forum.
 cheers mike
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