Hatsan Hatsan 125 5,5mm vortex spring

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David365

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May 31, 2024
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Hello, I own a Hatsan 125 air rifle, 5.5mm. It has a metal spring and achieves around 30J of energy. The air rifle performs very well at this power level. However, I am planning to replace the metal spring with a Vortex gas spring. I am facing a dilemma about what pressure to set it at to ensure the equipment works smoothly and accurately, but also with nearly the maximum possible energy as specified by the manufacturer. The Vortex spring states that it achieves maximum energy at 145 bar pressure. However, it seems to me that this might be too much. I don't want to damage my air rifle due to excessive recoil, etc. So my question is, to what pressure should I pump this spring to ensure it works optimally without going overboard?

Best regards.
 
As someone who has rebuilt the gas ram quite a few times, my first advice would be to stick with the coil spring! The gas rams can be rebuilt some have pressure release and some don't. I would definitely try to find one with the relief valve. About 2000psi is where I put mine and that is a tad over I believe, I have had it much higher and it was hard to shoot and the parts were screaming everytime I cocked it. But for reliability I would stay with the coil spring, I am wanting to convert mine the opposite of you. I do like the gas rams and am playing with different seals to get better longevity from them, but they have away of failing when you least expect it.
 
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Oddhawk said:
As someone who has rebuilt the gas ram quite a few times, my first advice would be to stick with the coil spring! The gas rams can be rebuilt some have pressure release and some don't. I would definitely try to find one with the relief valve. About 2000psi is where I put mine and that is a tad over I believe, I have had it much higher and it was hard to shoot and the parts were screaming everytime I cocked it. But for reliability I would stay with the coil spring, I am wanting to convert mine the opposite of you. I do like the gas rams and am playing with different seals to get better longevity from them, but they have away of failing when you least expect it.
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I understand, but unfortunately, I don't have the option to adjust the pressure of the Vortex myself. I can only purchase it with the desired pressure. As I mentioned, I don't want to overdo it, and that's all. You said that a value of 2000 psi (137 bar) is a bit too much. So, should I choose one that reaches 130 bar? Maybe 125 bar? I want the equipment to provide around 30 joules of energy. The air rifle also has a seal on the piston in the cylinder.
 
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The ones I have seen say 150 bar (2100psi) and that's what I would suggest, I had mine at one time up to 3000 psi it shot hard on both ends and I don't know how long the gun would have taken it and for all the extra cocking force and strain on the gun didn't gain much. If this is the path you go I would get a fill probe and a hand pump so you can fix them and adjust it, or at least buy a back up because they fail! I would also keep the coil spring and parts I am sure you probably could accomplish your goal with tuning and a heavier spring not to mention you will probably need to get a new end cap as they are different, are you looking at Hatsan brand gas rams or after market? I only have experience with the Hatsan ones and don't know how the other fits. The only real advantage I have seen to the gas rams is being able to leave it cocked and not stress the spring.
 
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The Vortex rams I've tinkered with have all said Max pressure 150 Bar and not to fill them over that. I've never owned the bigger 125 or 135, but at least in the Model 95's and 87QE's I've had, they were all set right around 125 Bar, so just a wild guess on my part but to get the higher power of the bit bigger rifles, I'd say something like 135 Bar?
Also have to remember at least on the 125, the stock is synthetic and is going to take some abuse from the extra pressure required to cock the rifle. 16962-Vortex-ram-body.jpg
 
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In the new version of Hatsan 125, it says that the maximum velocity is achieved at 145 bars. Is there anyone here who has a Hatsan from this series and knows at what pressure the airgun shoots energetically but safely? I've seen videos where they pump the Hatsan 125 to over 150 bars. But really, won't that be too much? Could it damage the airgun?
 
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I have four Vortex. Three 95’s and one 135. I recently converted all to springs. Much improved. My Vortex in all four could be let down. I set the 95’s at 125 bar and the 135 at 145 bar. They were maxed out at these levels but not to extreme in behavior. Caliber matters at what I would recommend. 177 would be better with less pressure. The heavier the pellet the higher the ram could be set. 5.5 caliber would be fine at 135-140 bar. IMHO
 
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I have a 130 and believe they are basically the same platform; use the calculator on pyramid air you probably are already close to the 30 joules you are looking for, maybe trying heavier pellets to get there. I am not trying to be rude in the least and it's your rifle to do with as you see fit! But I believe you are chasing a problem that doesn't exist! If I were you I would keep the spring and tune it from there. I have been reading this fourm for a long time and the others that have recommended to stick with spring are far more knowledgeable than I! I have set it to near where you are wanting and it's like trying too shoot a pogo stick! I have been shooting it for years and have to be on to hit my target consistently! 30 joules/22.5fpe) isn't going to do any good if you can't hit where you want. Now this is my opinion and always verify everything!! And now I will sit quietly in class from now on!!!lol
 
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I’ve got a Hatsan 135 and a Gamo Magnum, both with gas rams and I prefer the firing behavior of a ram. The only spring rifle I have shot in the same power range however was a Beeman Kodiak, so I don’t have a large sample size to compare with.

I found the Kodiak to be much more hold sensitive than either of my gas rams is. That very well could have been due to something else other than being spring powered though.
 
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