FX Maverick .30 Sniper Velocity

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So I have tried just about everything I can think of. Dual transfer port and pin probe did nothing. I have the 13gr hammer in the gun and I still cannot overcome the valve at 150 reg pressure. The gun just barely will shoot 44.75gr @ 945 fps at max hammer spring and 135 reg pressure. If you use more reg pressure the velocity goes down and I am out of hammer spring adjustment. I am at a loss why I cannot get more power out of this gun.

I even tried the Huma Air tuning spring and it did not help.

Could this gun possibly have the wrong hammer spring in it from the factory? Does anyone know what the spring should measure?
 
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Ram2jeep,

what I have been doing is when I increase the reg pressure then I back the hammer spring screw out ( counter clockwise ). The velocity increases like it should until I get above 135 bar on the reg then the velocity drops off and I run out of hammer spring adjustment because if I go further the gun will not cock.

I just ran some 65.5 slugs through it and they are at 805 fps and 43.8 are at 957 fps. That is all she has in her. My probe shows that it is adjusted correctly but when I mark the probe and take it out and insert it in the barrel up to the mark it covers at least 1/4 of the transfer port.I wonder if that is part of the problem. Not sure how to correct that since the probe screw lines up correctly in the access hole.
 
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Ram2jeep,

what I have been doing is when I increase the reg pressure then I back the hammer spring screw out ( counter clockwise ). The velocity increases like it should until I get above 135 bar on the reg then the velocity drops off and I run out of hammer spring adjustment because if I go further the gun will not cock.

I just ran some 65.5 slugs through it and they are at 805 fps and 43.8 are at 957 fps. That is all she has in her. My probe shows that it is adjusted correctly but when I mark the probe and take it out and insert it in the barrel up to the mark it covers at least 1/4 of the transfer port.I wonder if that is part of the problem. Not sure how to correct that since the probe screw lines up correctly in the access hole.
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This does sound like the problem. Blockages of the breech transfer porting account for a lot of the speeds that airguns loose. You do not want anything in that portion of the transfer port except for the pin portion of the probe. The pellet or slug should be past the transfer port and started into the rifling as well.

I am intimately familiar with the original FX Impact, but not the new Maverick. But what I can suggest is try to determine if there's an adjustment on the cocking mechanisms that will allow you to adjust the depth the probe so it is seating the pellets and slugs past the port and also not allowing the probe to interfere in the airflow either.

Alternatively, instead of buying a bunch of aftermarket stuff and the like, you can send it in to FX under warranty, as it is not functioning as advertised.
 
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I have the .30 maverick with 600mm barrel

I can shoot the 44.5 hybrids at 965

front reg is about 170, back is 150

i use the 13g hammer that comes with the .22/.25 slug kit. 

i forget exactly where my hammer spring is adjusted but it is not at all maxed out. I can measure it today if you need it. 

i can tell you that a heavier hammer makes a huge difference. 
 
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Bigmike - I was mistaken on my hammer setting. I am very close to max. My adjustment screw is at 7mm and my dial is at 3. At 7mm on the adjustment screw I don’t think my gun will cock on dial setting 6 or 7. 
- my hammer is a larger one that came with my .22/25 slug kit (I also have a .22 maverick). The stock hammer I received with the .30 didn’t have enough weight to make higher velocity around 960. It was also a bad design using a small hammer and a little donut washer to add weight. It didn’t slide well either. 
- front reg is 170, back is 150

- speed on dial setting 3 is 965 roughly. 

 
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Ok, sounds like you have about as much hammer spring as the gun will allow. You could probably back it off a bit and get the same results on setting #7. I am going to see what FX says on Monday. I could live with a velocity at 965 if my reg was at 150. It bothers me that I can’t set my reg above 135 to me that means something is not working right. Everything I read is with a 13gr hammer you should be able to go to 150 reg pressure and I am sure my hammer weight is 13gr.
 
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So I have tried just about everything I can think of. Dual transfer port and pin probe did nothing. I have the 13gr hammer in the gun and I still cannot overcome the valve at 150 reg pressure. The gun just barely will shoot 44.75gr @ 945 fps at max hammer spring and 135 reg pressure. If you use more reg pressure the velocity goes down and I am out of hammer spring adjustment. I am at a loss why I cannot get more power out of this gun.

I even tried the Huma Air tuning spring and it did not help.

Could this gun possibly have the wrong hammer spring in it from the factory? Does anyone know what the spring should measure?
Click to expand...

My second Maverick I got had a hammer spring that was shorter than the one in my first Maverick. I think the newer one was around 52mm long and the older was 56mm? I'm going completely by memory on those numbers. Anyway, my new Maverick flat out wouldn't make power just like yours. I think it topped out around 100fpe. I put the hammer spring from my old one in it, and bingo! The shorter hammer spring from the factory was my issue. You mentioned you tried the Huma tuning spring, as in the Huma hammer spring?? I'm running the Huma Impact hammer spring in my older Maverick, and the older factory hammer spring in my newer one. Have you measured the length of your hammer spring?

I wouldn't expect a slight barrel port blockage to limit you that much. Definitely measure that hammer spring if you haven't.
 
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I've been slacking lately with paying attention to the forum, so I just saw your post today... On the bright side, at least the hammer spring is really easy to get to on the Maverick, haha. Yeah, the fact that the Huma spring didn't help is odd, because what you've described is exactly what my gun was doing. My gun was running out of steam around 130 bar too I think. At least you'll know for sure after you measure the spring.
 
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Well we may have found the problem. My Maverick has the 52mm spring in it. I will be discussing this with FX tomorrow. Hopefully this will solve the problem.

The Huma spring is about 57mm but seems to be much stiffer I may reinstall it and see if I can improve the velocity.

Thanks Rallyshark and everyone else who gave me input trying to help with the problem.
 
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I sure hope that's the problem man. I know how frustrating it can be with this stuff sometimes. I say put the Huma back in there and see what it can do. I don't know if you got the Huma spring that is designated for the Maverick or the Impact, or if there's any difference in them for that matter. I have the one for the Impact, and it was probably 55-56mm and only slightly stiffer than the factory 56mm spring. I wouldn't worry too much about the Huma spring being too much stiffer. You've got plenty of room in that hammer spring adjustment to be just fine. Good luck!
 
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