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.25 CO2 beast |
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BC_Clark 
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Joined: 16 Feb 2024 Location: Auckland Status: Offline Posts: 10 |
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 Topic: .25 CO2 beastPosted: 29 May 2026 at 10:07pm |
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I love seeing custom builds. Following this build with interest. CO2 is well capable of 30 ft-lbs in .25 and it may use less gas than expected. e.g. I got 26 ft-lbs in .35 from a 6" barrel and it used 1.1 grams per shot. |
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kruzaroad
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Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 3016 |
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Posted: 25 May 2026 at 9:52pm |
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Plenty for a evenings hunting. Goat/wallaby hunting at that.
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nunga
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Joined: 09 Mar 2013 Location: Pukekohe Status: Offline Posts: 1123 |
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Posted: 25 May 2026 at 8:44pm |
To get 30FPE it will take approximately 2.2 grams of CO2 per shot with the 120cc tank i will have screwed to the Sodastream bottle, so the math says 182 of usable shots. So i can safely say 150 shots per tank.
Edited by nunga - 25 May 2026 at 8:46pm |
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2nd place HP springer - WFTF World Championships 2014
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nunga
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Posted: 25 May 2026 at 7:36pm |
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Next step is to make the 120cc tank, Hammer and ports on a hot summers day 30.0 °C it would push it up to around 1200
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2nd place HP springer - WFTF World Championships 2014
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kruzaroad
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Posted: 25 May 2026 at 7:14pm |
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What sort of pressure increase would say a 20° day give it.
Pish it to a 950psi? How consistent are you expecting the refills to be? I'm guessing that they should be pretty well pressure regulated at refill place. Whats the next step? |
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Pauly5
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Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1742 |
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Posted: 25 May 2026 at 6:44pm |
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That's looking great Nunga. I can't believe I had missed the earlier posts.
I was thinking of doing a CO2 bulk fill carbine with a 30 cal barrel I have, so I will enjoy watching this.
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nunga
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Posted: 25 May 2026 at 5:38pm |
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So I solved the thread problem. I made a homemade die nut to clean up the threads.
I had to use another pressure gauge because the nice new one had a nipple on the bottom which got in the way of the shaft so I installed my old flat bottom gauge.
900 PSI is more than expected and it is winter as well
with 19 degrees so that’s good pressure.
So now i can move on with the build since the tests have proven very successful. |
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2nd place HP springer - WFTF World Championships 2014
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kruzaroad
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Posted: 23 May 2026 at 10:08pm |
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Cut one on the lathe. If your just tiding up thread basically a harden nut would do the job.
Edited by kruzaroad - 23 May 2026 at 10:09pm |
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nunga
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Posted: 23 May 2026 at 9:58pm |
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Yeah thats probably the best option. For now ill just try to find a full bottle to test that has a good thread. If it all works out ill look at what a die is worth
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2nd place HP springer - WFTF World Championships 2014
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kruzaroad
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Posted: 23 May 2026 at 9:31pm |
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Other option might be to get a die and just tidy up threads on the bottles that don't fit when you get them. Assuming they must be pretty close. Would still work in a soda stream when connected and wouldn't be noticed when swapping bottles
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nunga
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Posted: 23 May 2026 at 9:04pm |
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I do not have the technology to full the bottles myself as they are liquid CO2 when full. I would need some way of freezing the gas then full the bottles in liquid state. (i think) Making a sleeve might work but then the wall thickness of the adapter will need to be bigger to take the different inserts. this might not be practical.
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2nd place HP springer - WFTF World Championships 2014
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kruzaroad
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Posted: 23 May 2026 at 8:27pm |
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Could you make a new adaptor that takes a sleeve you can screw in and out and have slightly differnt threads for the bottles. Can you make a adaptor for filling the bottle and get co2 in a bulk bottle and fill the canastas that work yourself?
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nunga
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Posted: 23 May 2026 at 3:27pm |
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So just a quick update. I have made everything and test fitted to make sure all the orings seal and so forth. Went to the shop and swapped the empty bottle that i used as a template to cut the threads in my adapter, Screwed the new full bottle in and the threads bound up halfway screwing it on. I have 3 bottles here as i have a sodestream machine here to make my cola for my whiskey I make. All 3 bottles have slightly different threads by the looks. one screws in just fine, the other is a little tight and the last one only gets half way. This is going to be a problem. Their quality control on their bottles is not the best. Probably because its designed to screw onto a lose fitting plastic nut in the machine with very back low pressure. I need my threads perfect if they are going to hold the full pressure of the CO2. So i will have a little think about who to safely overcome this problem.
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2nd place HP springer - WFTF World Championships 2014
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nunga
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Posted: 17 May 2026 at 10:42pm |
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Ha ha, sure thing!
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2nd place HP springer - WFTF World Championships 2014
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Ashman
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Posted: 17 May 2026 at 10:16pm |
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Holy sh*te there's mad ass engineers on here.
When you've finished that, any chance of building me a time machine? Just a basic one. Nothing fancy. Will need a dunny though.
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-Ec wrote:
