Snowpeak Artemis P15 5.5mm - location of hammer spring adjustment screw

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J

JMF87

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Dec 6, 2024
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Good Afternoon all. I would like to know where the adjustment screw for the Artemis P15 is located at on the rifle? I would like to tinker a bit with fps with my current pellets (Hades 15.89gr) which is running at 834fps avg. I would like to possibly take it up up between 875fps and 925fps depending on what my pcp like. The reason for the adjustment is that this is my son's (6 year old) first rifle which he will shoot birds, meerkat and or rabbits with while we are on hunting farms, so he is not precise with his shot placements and I want to go up a few grains in pellet weight or even go to 21 gr slugs if he does miss the head, the impact would be great enough to humanely take the animal down.

Here is some 5 shot groups I took one evening at about 10 meters. The rifle was zeroed on 25 meters with the Hades.

Hades 15.89gr @ 10mts 834fps.jpg


H&N Hornets 16.20gr @ 10mts.jpg
 
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Vetmx said:
Looks like just two to chose from. A reg or a reg with an additional plenum. You’ll be fine with just the reg with your .177
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my partner is ordering the artemis p15 power tune regulator set by huma air mate, is that any good? we both think it's what I'm after because it can be set to just under 12 lb which is something I'm looking for, not cheap are they lol, but if it's worth it then I can live with that. I just need to know what to set it to ect lol. thank's again 🤝👍
 
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The Huma will have a paper tape label on it if it is like the one in my Caiman X. For a 177 I would set it to 130 bar. But that will not produce 12 fpe, it will be more like 18 fpe. If you want 12 my guess is about 120 bar would be better. It is a little hard to see the line on the regulator adjustment screw but there is a scribed line across the face of the adjustment screw and you turn it to the marking on the paper tape.
 
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JimD said:
The Huma will have a paper tape label on it if it is like the one in my Caiman X. For a 177 I would set it to 130 bar. But that will not produce 12 fpe, it will be more like 18 fpe. If you want 12 my guess is about 120 bar would be better. It is a little hard to see the line on the regulator adjustment screw but there is a scribed line across the face of the adjustment screw and you turn it to the marking on the paper tape.
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hi thank you for your help 😁, now I'm going to just buy the huma I've got to measure ut, because i'm looking at the xl plenum by huma air and need to know if that would fit? so if anyone know's could you please help me thank you 🤝
 
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SciueraPlumbea said:
unless you have a regulator tester it's going to be difficult. Also with 177 I don't know the operating pressures best for the platform, i've only had .22s. If you have the FAC version I'm sure you can increase velocity a good bit more than that. The easiest solution for you to increase power and KNOW the power you're at is to order the HUMA-AIR p15 power tune reg with the XL plenum. That simple purchase will go a looooong way.

huma-air.com

Artemis P15 Power Tune Regulator and XL Plenum By Huma-Air

Huma-Air P15 pressure regulator with XL plenum. The upgrade when it comes to power. This set gives you more consistency and speed! A must have.
huma-air.com huma-air.com
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hi so if I was to buy that regulator that you sent me in a pic that would fit the artemis p15 rifle then? many thank's D
 
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dk-duck said:
hi thank you for your help 😁, now I'm going to just buy the huma I've got to measure ut, because i'm looking at the xl plenum by huma air and need to know if that would fit? so if anyone know's could you please help me thank you 🤝
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Email Huma (great people). Pretty sure it will fit but won't buy you much in a 177. I corresponded with them about which regulator my BS22, and the answer was that *in 22*, the standard reg will work for anything but the last few drops of power. Plenum is probably not the constraint.

BTW, the standard reg works great, and gives you a few more cc's of reservoir space over the XL.
 
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What pennyroyal said is completely true. The way the Huma design creates extra plenum space is it pushes the regulator further into the air tube. That reduces the amount of full pressure air you can store. SPA sizes these guns for 22 caliber and the 177 has plenty of power as a result. My P35-177 easily makes 19 fpe. 900 fps on 10.65 grain pellets. No added plenum, reg about 130 bar. Accurate. It also shoots 12.5 grain Nielsen slugs pretty well. If I wanted more power I would raise the regulator a little. No need for more plenum. Reducing your air storage space means you will have fewer shots per fill.
 
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Vetmx said:
I put a Huma in mine back in 2017. The reg got here before the gun did. But I believe now they offer 2 different size regs for P15‘s. It depends on the internal diameter of your air tube. I will take a look at Huma’s sight and see if there is an easier way to determine which one you need without having to measure the ID of your tube
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pennyroyal said:
Email Huma (great people). Pretty sure it will fit but won't buy you much in a 177. I corresponded with them about which regulator my BS22, and the answer was that *in 22*, the standard reg will work for anything but the last few drops of power. Plenum is probably not the constraint.

BTW, the standard reg works great, and gives you a few more cc's of reservoir space over the XL.
Click to expand...
dk-duck said:
hi so if I was to buy that regulator that you sent me in a pic that would fit the artemis p15 rifle then? many thank's D
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Are you looking for a power increase or just a more efficient regulator? The one i sent is if you'd like to generate more energy.

if you're looking for just more efficiency and consistency you'll want this one.
huma-air.com

Artemis P15 tuning pressure regulator

Huma-Air tuning regulator as replacement for the Chinese factory regulator for the Artemis P15
huma-air.com huma-air.com


the "XL" allows a larger amount of regulated air to be held "on deck" for the shot, the benefit of which is A) likely increase in power at the same pressure set, b) allowing slightly lower pressures to be used, c This regulator is typically a bit more efficient the cons :You will also lose a small amount of Reservoir volume as mentioned before.
 
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SciueraPlumbea said:
Are you looking for a power increase or just a more efficient regulator? The one i sent is if you'd like to generate more energy.

if you're looking for just more efficiency and consistency you'll want this one.
huma-air.com

Artemis P15 tuning pressure regulator

Huma-Air tuning regulator as replacement for the Chinese factory regulator for the Artemis P15
huma-air.com huma-air.com


the "XL" allows a larger amount of regulated air to be held "on deck" for the shot, the benefit of which is A) likely increase in power at the same pressure set, b) allowing slightly lower pressures to be used, c This regulator is typically a bit more efficient the cons :You will also lose a small amount of Reservoir volume as mentioned before.
Click to expand...
yes I'm after more power than I'm getting now with that bust up regulator because they're not even reaching 850.00 with a 7.56 grain pellet I'm getting, well sorry the best I got was 839.3 which is a disappointment 😕, and the 10.34 grain are getting in there 750.00 area. when I got the gun is was shooting fine I got a few times 1000fps after that they stayed in the 9 90 980 fps but yes ultimately I'm after power 🤝 thank you
 
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dk-duck said:
yes I'm after more power than I'm getting now with that bust up regulator because they're not even reaching 850.00 with a 7.56 grain pellet I'm getting, well sorry the best I got was 839.3 which is a disappointment 😕, and the 10.34 grain are getting in there 750.00 area. when I got the gun is was shooting fine I got a few times 1000fps after that they stayed in the 9 90 980 fps but yes ultimately I'm after power 🤝 thank you
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hi thank you for replying to me so would the smaller one, the one that doesn't have the plenum, does that one let you go up to 12 lb and above by any chance? if I was to get the one with the plenum how much air space would be lost, alot, or a small amount? thank you 🤝 all the best D
 
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dk-duck said:
hi thank you for replying to me so would the smaller one, the one that doesn't have the plenum, does that one let you go up to 12 lb and above by any chance? if I was to get the one with the plenum how much air space would be lost, alot, or a small amount? thank you 🤝 all the best D
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At least 12cc id estimate 15-16cc

and yes, it most definitely should with the smaller one. 8.44 @ 1000fps is 18.75 Ft Lbs I would think 18-21 would be possible.


I think you'd be safer off getting the Smaller one. It will have AT LEAST the same exact energy output as your stock regulator(at the beginning when the stock reg was functional) 10.34 in the upper 900's. There is always the chance that your tube is stepped differently inside and that the XL might require extra machining. Not likely, but, always possible.
 
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SciueraPlumbea said:
At least 12cc id estimate 15-16cc

and yes, it most definitely should with the smaller one. 8.44 @ 1000fps is 18.75 Ft Lbs I would think 18-21 would be possible.


I think you'd be safer off getting the Smaller one. It will have AT LEAST the same exact energy output as your stock regulator(at the beginning when the stock reg was functional) 10.34 in the upper 900's. There is always the chance that your tube is stepped differently inside and that the XL might require extra machining. Not likely, but, always possible.
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thank you very much, how much air would be lost if I had of ordered the one with the plenum?? it takes a good while for me to even start filling up? Just curious thank you everyone 👌👍🤝 D
 
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dk-duck said:
thank you very much, how much air would be lost if I had of ordered the one with the plenum?? it takes a good while for me to even start filling up? Just curious thank you everyone 👌👍🤝 D
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4.5%-6% roughly . Not much. The real risk is if the step isn't where it should be and you have an 80-100 $ paper weight. Shipping to the US from huma is going to be around another $35
 
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SciueraPlumbea said:
4.5%-6% roughly . Not much. The real risk is if the step isn't where it should be and you have an 80-100 $ paper weight. Shipping to the US from huma is going to be around another $35
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thank you for your help and advise 😁 it's costing around £120, it say's that you can huma set your regulator up for you, so that's a bonus because truthfully I wouldn't know where to set it, my gun club is 12lb, anything above and as we all know it then need's a licence, so I'll be more than happy with it at 12 lb, so I've asked my partner when she ordered it to have it set at that for me. if I need any more help I'll be asking for help again from you guy's 😁 thank you all you're help so far ✌️🤝😊👍
 
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dk-duck said:
thank you for your help and advise 😁 it's costing around £120, it say's that you can huma set your regulator up for you, so that's a bonus because truthfully I wouldn't know where to set it, my gun club is 12lb, anything above and as we all know it then need's a licence, so I'll be more than happy with it at 12 lb, so I've asked my partner when she ordered it to have it set at that for me. if I need any more help I'll be asking for help again from you guy's 😁 thank you all you're help so far ✌️🤝😊👍
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Wait. You’re in uk? Do you have an FAC
 
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dk-duck said:
thank you for your help and advise 😁 it's costing around £120, it say's that you can huma set your regulator up for you, so that's a bonus because truthfully I wouldn't know where to set it, my gun club is 12lb, anything above and as we all know it then need's a licence, so I'll be more than happy with it at 12 lb, so I've asked my partner when she ordered it to have it set at that for me. if I need any more help I'll be asking for help again from you guy's 😁 thank you all you're help so far ✌️🤝😊👍
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You're in fact going to need a new valve and a few other parts to be able to exceed 12 ft lbs. there are more factors than pressure preventing you from full power.

you'll need "HIGH POWER VALVE Pin,Spring, and housing. Possibly different main spring. I dont know if your Transfer port and barrel port are restricted too, you'll need to check and fine someone else with an FAC .177 p15 and ask their port sizes. It might be the same and just the reg and valve, but, that i'm not 100% on
 
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SciueraPlumbea said:
Okay, didn't want to get you into trouble.

It might be cheaper to go to Bagnall and kirkwood

https://spares.bagnallandkirkwood.co.uk/smk/smk-artemis-p15-air-rifle-spare-parts/ and get the OEM parts. They're located in the UK. great company. Other wise the Huma XL plenum reg is the way to go
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lol thank you for thinking about me not getting into trouble 😂 and yes bagnall and kirkwood are like our local shop for missing part's, extra thing's etc, and to be honest with you I wouldn't want to buy a regulator from them, their not the best place, their everyone's go to for quickness really, although they do have some good thing's lol and she's now said it's the one with the plenum 🙄 I suppose that shouldn't be a problem should it? well it must be OK if you're saying that's the way to go, thank you so much for responding to me and helping me out anyway you can👌🤝
D
 
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The one with the spacer to add plenum will work. Based upon my results with a Bullshark that was not working when I got it you probably only needed to replace the O-rings in the stock regulator to make it work. But a new Huma will be nice and you will be able to rebuild it easily if you ever need to (they sell an inexpensive rebuild kit).
 
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