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FX Maverick full beans!

Forums PCP Airguns PCP Airgun – Tuning & Repair FX Maverick full beans!

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    Rallyshark
    Participant
    Member
    United States
    Accuracy: +9

    I decided it was time to give my Maverick all the beans, and see how far I could really take it as a dedicated hunting rig.  Especially, since I have another one that I can stick to target fun with(or a backup). 

    The Maverick I'm using hasn't been "stock" for a very long time.  Below are what it's power mods were prior to this latest tuning session:
    -700mm barrels in .22/.30
    -custom 15-16 gram hammer weights
    -Huma hammer spring
    -Huma extra high pressure regulators
    -Opened valve seat to 7.2mm, PEEK poppet
    -Modified barrel ports
    -Pin probes
    All of that combined with high reg settings gave me a peak of around 85 fpe in .22, and 136 fpe in .30.  That was with the reg at 205 bar and a 300 bar bottle.  I'm not telling anyone to run their guns at that pressure, and you do so at your own risk and voiding of your warranty.  The bottle is a true 300 bar bottle, and the regs are rated to 210 bar, fyi.  My hunting tunes were usually around 80 fpe in .22 with 36 grain slugs, and 130+ fpe in .30 with 65.5 grain slugs.  Those numbers are quite good for a "BB gun", and would drop most any critter I wanted.  Still, I wondered what more I could get out of it…

    This past few weeks I set about doing the only other things I could think of to get more power(without major valve re-design).  First, I ordered another rear plenum section.  I removed the front section containing the 2nd reg, and simply replaced it with the extra rear plenum section I had ordered.  Given the high reg settings I was using for making power, the 2nd reg wasn't really necessary anyway.  Now the gun has one regulator and a massive plenum which is probably over 125cc.  The best part is, I just screwed the 2nd reg section off and screwed the plenum section on, and no other modifications were needed.  It don't get much easier than that!  That simple change managed to send 36 grain .218 slugs at 1060 fps for 90 fpe in .22!  Next up, the .30 managed to send 78 grain slugs at 931 fps, for 150 fpe!  That extra plenum definitely helped the .30 the most.  Either one of those calibers would put the hurt on a porker noggin, haha.

    While that was it for .22(until the 800mm barrel comes out), that wasn't it for the .30…  I ordered myself a 1:16 twist .300 blank from TJs to take it up one more notch.  I started with a 34" blank, but bored and ported the last 2" so it would vent into a custom shroud.  I still want to keep this gun quiet.  The resulting barrel is about 32" long, which I finished up today.  Thank god for bullpups, otherwise, this gun would be way too long.  Anyway, I added a 1/4 turn to the hammer spring and let some lead fly over the chrony.  The NSA 65.5 grain slugs were cruising along at 1043 fps!  Then, time for the 78 grain Griffin slugs.  Those tripped the chrony at 967 fps!  That's 162 fpe  :o :o  NOW, the Maverick is a proper hammer :D  On a side note, I don't know what the shot count is at these power levels, but it is better than you'd think.  I didn't run full strings, because I didn't want to waste the slugs.  I'm estimating 35-45 shots in .22 and 20+ shots in .30 at those power levels.

    Of course, the real test will come down to how it shoots.  I know the .22 is a laser with the 36 grain slugs, so not many worries there.  The real unknown will be how that 16" twist TJs barrel performs.  I haven't seen any info about anyone using that particular one, so I have no idea how it will perform.  I've seen plenty of folks with the 26" twist TJs, but none on the 16".  Heck, I didn't even know they had a 16" twist .300 barrel, until I emailed them and asked if they had anything with a faster twist.  To my surprise, they did!  It may be a couple of weeks, before I can test the .30 for accuracy.  I don't like shooting those power levels at my house, it just isn't safe.  I'll have to wait, until I can get to the range to test it.  Hopefully, it won't all be for nothing.  I'll try and post a picture in the next day or two for reference.  Thanks for reading guys!
     

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    legionair
    Participant
    Member
    United States
    Accuracy: +29

    Impressive what you did with that maverick! Do you think a balanced valve would help squeeze more power?

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    Long_Gun_Dallas
    Participant
    Member
    United States
    Accuracy: +36

    Full beans indeed.  Probably the highest reg pressure I've heard of anyone running on an FX!  Are you using griffin 36 boat tails BTW?  I used those in my 700mm Crown @65fpe and they just stacked @100yrds like I was shooting @ 20yrds.

    Great work either way.  I hope the 1:16 works well with those heavier slugs!  I understand how you feel about the 30.  Mine barely makes over half the power of yours and it makes me nervous to shoot most places. 

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    Rallyshark
    Participant
    Member
    United States
    Accuracy: +9

    legionair

    Impressive what you did with that maverick! Do you think a balanced valve would help squeeze more power?

    Thanks!  I have no doubt a balanced valve with larger porting would increase the power even more.  Unfortunately, the Maverick doesn't really lend itself to a balanced valve design.  Well, not one that I have the ability to make at least.  The way most of it is housed directly in the breech block would require some serious skill and tooling that I don't have…  I did see someone do it on an Impact and make more power than I have at 180-185 bar I think.

     

    • This reply was modified 4 months ago by  Rallyshark.
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    Rallyshark
    Participant
    Member
    United States
    Accuracy: +9

    Long_Gun_Dallas

    Full beans indeed.  Probably the highest reg pressure I've heard of anyone running on an FX!  Are you using griffin 36 boat tails BTW?  I used those in my 700mm Crown @65fpe and they just stacked @100yrds like I was shooting @ 20yrds.

    Great work either way.  I hope the 1:16 works well with those heavier slugs!  I understand how you feel about the 30.  Mine barely makes over half the power of yours and it makes me nervous to shoot most places. 

    Thanks!  Yessir, I'm definitely pushing the limits on this gun.  It is a hunting gun after all, so tons of shots aren't all that important.  The max power number for the .22 was with the Griffin BT 36 grain indeed.  I normally shoot the flat base 36 grain, because they fit the magazine.  I just happened to have the BTs sitting beside me when I tried it.  I suspect the flat base would be 10-15 fps slower, given the higher drag in the barrel.  I consider the .22 a known result, since I know it's accuracy.  The .30 is another case all together with that new barrel though.  I sure hope it isn't a dud, lol.  But yeah, there are just too many houses around to test it at home on target.  Hopefully, I'll be able to find out soon though.

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    Rallyshark
    Participant
    Member
    United States
    Accuracy: +9

    Here's a picture of the Hunting rig.  The parts without the camo show the obvious, which is the new shroud/barrel and extra plenum section in place of the 2nd reg section…

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    ram2jeep
    Participant
    Member
    United States
    Accuracy: +11

    The Maverick in .30 shooting at the Impact .35 power level. I shoot both the Maverick in .30 and the M3 in .35. Those numbers are nice to see and shows the range of what can be done. I did put the 700cc 300 bar bottles on both for a few extra shots.

    • This reply was modified 4 months ago by  ram2jeep.
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    napairgunner
    Participant
    Member
    United States
    Accuracy: +4

    What is the primary game that you going after with a setup like this?

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    Rallyshark
    Participant
    Member
    United States
    Accuracy: +9

    ram2jeep

    The Maverick in .30 shooting at the Impact .35 power level. I shoot both the Maverick in .30 and the M3 in .35. Those numbers are nice to see and shows the range of what can be done. I did put the 700cc 300 bar bottles on both for a few extra shots.

    I've considered getting the 700cc bottle before, but I need to put a hold on spending for a bit.  Of course, that bottle would fit this gun really well with that longer barrel now.  I'll have that in the back of my head for a while I think, haha.  On that note, does anyone have the 300 bar bottle valves in stock?  I haven't looked lately.  These guns sure are flexible, no doubt.  

    napairgunner

    What is the primary game that you going after with a setup like this?

    I mostly go after hogs with it, but I also intend to try and get some whitetail deer with it too.  Here in GA, .30 air guns are legal for deer, which is the primary reason I have it in .30.  I didn't have any shooters this season, so I'll have to hope for next year.  Were it not for the deer, I probably would have stuck with .22, because it works great on porker noggins 😀  

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    jasmlowe
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    Member
    United States
    Accuracy: +27

    Rallyshark

    ram2jeep

    The Maverick in .30 shooting at the Impact .35 power level. I shoot both the Maverick in .30 and the M3 in .35. Those numbers are nice to see and shows the range of what can be done. I did put the 700cc 300 bar bottles on both for a few extra shots.

    I've considered getting the 700cc bottle before, but I need to put a hold on spending for a bit.  Of course, that bottle would fit this gun really well with that longer barrel now.  I'll have that in the back of my head for a while I think, haha.  On that note, does anyone have the 300 bar bottle valves in stock?  I haven't looked lately.  These guns sure are flexible, no doubt.  

    napairgunner

    What is the primary game that you going after with a setup like this?

    I mostly go after hogs with it, but I also intend to try and get some whitetail deer with it too.  Here in GA, .30 air guns are legal for deer, which is the primary reason I have it in .30.  I didn't have any shooters this season, so I'll have to hope for next year.  Were it not for the deer, I probably would have stuck with .22, because it works great on porker noggins 😀  

    It's amazing how state laws for hunting vary. I am one state up in TN and the .30cal airgun is a no-go for hunting period on any size game. It's almost like it doesn't exist to those making the hunting laws. I would love to have a .30cal airgun and as soon as TN makes it legal I will. 

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    Rallyshark
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    United States
    Accuracy: +9

    I have no idea why TN would be like that?  I'd expect them to be fairly open to it.  There are a lot of states that are air gun friendly though.  

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    jasmlowe
    Participant
    Member
    United States
    Accuracy: +27

    They're  not against as they have updated their laws to allow 25cal and below on small and medium game and 35cal and above on large game. Its just that 30cal is absent all together. 

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    Rallyshark
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    United States
    Accuracy: +9

    That makes it even more weird!  Oh well, they'll figure it out one day I'm sure.  

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    Cranky1
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    United States
    Accuracy: +14

    Dang that is impressive! And I was excited to see 105fpe out of a Leshiy2(traded my maverick for it) I’m getting 55grn avs to 930fps for about 16 shots. I’m going to try for a yote. 

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    Rallyshark
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    United States
    Accuracy: +9

    Cranky1

    Dang that is impressive! And I was excited to see 105fpe out of a Leshiy2(traded my maverick for it) I’m getting 55grn avs to 930fps for about 16 shots. I’m going to try for a yote. 

    Thank you!  Those Leshiy 2's are very cool little guns.  I think they can make some pretty serious power, if you give them enough barrel.  How long is the barrel on yours?  I'd love to play with one of those too.  I'm sure that 105 fpe will take care of a yote just fine.  

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    AncientSword
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    United States
    Accuracy: +21

    Very impressed by that setup, good work.

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    Rallyshark
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    United States
    Accuracy: +9

    Thanks AncientSword!  I'm waiting to get some proper target/testing time with it, before I call it done.  I need it to like some slugs in the 65.5-78 grain range(hopefully).  If I can confirm everything works and the gun is accurate, then I'll get that shroud and extra plenum section back in camo.  Then, I'll call it done 🙂  

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    Cranky1
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    United States
    Accuracy: +14

    Rallyshark

    Cranky1

    Dang that is impressive! And I was excited to see 105fpe out of a Leshiy2(traded my maverick for it) I’m getting 55grn avs to 930fps for about 16 shots. I’m going to try for a yote. 

    Thank you!  Those Leshiy 2's are very cool little guns.  I think they can make some pretty serious power, if you give them enough barrel.  How long is the barrel on yours?  I'd love to play with one of those too.  I'm sure that 105 fpe will take care of a yote just fine.  

    I’m running a 600mm, honestly I haven’t had time to tinker but I’m running .1/.1 jets at 195bar. I was told I can run upwards of 250bar. I’ve got the adapter that would let me run a 700mm fx barrel, might get a little more power. I feel over 100fpe for 16 shots in a light weight setup is pretty good. 
     

    I really hope Ed trickles this valve into a bullpup. I would even be fine if it was a bolt action with the hammerless setup. 

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    Rallyshark
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    United States
    Accuracy: +9

    Cranky1

    Rallyshark

    Cranky1

    Dang that is impressive! And I was excited to see 105fpe out of a Leshiy2(traded my maverick for it) I’m getting 55grn avs to 930fps for about 16 shots. I’m going to try for a yote. 

    Thank you!  Those Leshiy 2's are very cool little guns.  I think they can make some pretty serious power, if you give them enough barrel.  How long is the barrel on yours?  I'd love to play with one of those too.  I'm sure that 105 fpe will take care of a yote just fine.  

    I’m running a 600mm, honestly I haven’t had time to tinker but I’m running .1/.1 jets at 195bar. I was told I can run upwards of 250bar. I’ve got the adapter that would let me run a 700mm fx barrel, might get a little more power. I feel over 100fpe for 16 shots in a light weight setup is pretty good. 
     

    I really hope Ed trickles this valve into a bullpup. I would even be fine if it was a bolt action with the hammerless setup. 

    Those guns are so cool to me.  I don't know enough about them, but I'd think 16 shots at that power level from that little gun is pretty good.  If I had one, I'd tear up up probably,lol.  It would be neat if they'd put that action in some other guns for sure.

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    Bigragu
    Participant
    Member
    United States
    Accuracy: +82

    Great job, Donny. If anyone can ramp up a maverick, that would be you! You sure have come a long ways from the Hatsan big power days at the GTA, ha Ha! Your hatsans are probably like gamo urban power gun’s when compared to that maverick!

    • This reply was modified 4 months ago by  Bigragu.
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