Finding a slug to fit my m3 .25 well.

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LDP said:
Mine is shooting fx hybrids very good but I ordered the tensioned barrel system and I dont know if it came with the 1:18 or 1:16. I asked utah airguns but he said he wouldnt know which it came with. Evidently after a certain date the tensioned system would come with the 1:16 for the .25. I dont want to pull it apart to verify since I got it shooting good. I bought mine in the last 3 months so theres a chance its the 1:16.
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I also bought mine 2months ago, is it just as easy to just take out the lock nut and slide the liner out?
 
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Gambler said:
I guess i do the total opposite, i try the lowest possible preassure with vale a few turns out past the 4th line, i Will set preassure at 150 and turn the valve in tomorrow and start from scratch again :)
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This should warrant you better results, anytime my impact would should slugs phenominally the reg would always be at 135b or higher.
 
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Gambler said:
I also bought mine 2months ago, is it just as easy to just take out the lock nut and slide the liner out?
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with the barrel tensioner you have to remove the carbon fiber outer sleeve that replaces the normal shroud then remove the liner lock nut to pull the liner. For the standard setup with the normal shroud you just unscrew the shroud and slide it off. With the shroud removed the lock nut for the barrel liner can be removed and then the liner can be pulled out.
 
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LDP said:
with the barrel tensioner you have to remove the carbon fiber outer sleeve that replaces the normal shroud then remove the liner lock nut to pull the liner. For the standard setup with the normal shroud you just unscrew the shroud and slide it off. With the shroud removed the lock nut for the barrel liner can be removed and then the liner can be pulled out.
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Ill take mine out tomorrow and look what it is, but at the shop they said it was havy liner inside
 
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Gambler said:
Ill take mine out tomorrow and look what it is, but at the shop they said it was havy liner inside
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If you dont verify for yourself whats engraved on the liner you wont really know what it is. Its been shown over and over thru the years that FX or its distributors piece together parts in a some what random nature at times. I have a .30 cal liner I got from a crown mk2 barrel change kit thats not even marked. Its also not any of the twist rates listed for a .30 cal. Its a 1:24 twist. Its easy to measure since FX liners have the marks from the rifling on the outside. The liner is 24" long and I marked one of the grooves then followed it. It came back to the same side as the muzzle at the end of the liner so a 24 twist.
 
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Is stamped 1:18 and if I meassure right it did one full revolution in 18in.

Also did turn my preassure up to 145bar and turned my valve in, got the speeds but still not the groupings.
I have tungsten hammer installed and its probably to heavy to adjust the PW when I have that valve turned in as much as I have, so maybe need to but stock hammer back in
 
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Gambler said:
Is stamped 1:18 and if I meassure right it did one full revolution in 18in.

Also did turn my preassure up to 145bar and turned my valve in, got the speeds but still not the groupings.
I have tungsten hammer installed and its probably to heavy to adjust the PW when I have that valve turned in as much as I have, so maybe need to but stock hammer back in
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Hammer would have been my next thought too.
 
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I too have been chasing .25 slug accuracy with no luck at 100y but reasonably tight at 50y.

I have tried everything that I could buy in the US, not one of any weight has made 1MOA at 100y.

I have all 5 of the .25 x 700mm liners, 3 are identical as far as I can tell but one has a different part number.

My 1:16 that I got from FX USA has the same part number as one of my 1:18 liners.

Clear as mud...

I wish you well but I gave up and I run .22 or .30 now with fantastic results at 100y. My AEA Varmint now eats all of the .25 slugs with just a hair over 1MOA at 100y, good enough for any critter that likes to damage our little farm.
 
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Mine worked at 150 bar with factory hammer. I would say at 145 bar and the tungsten hammer you are holding the valve open longer than it needs to be. I think the tungsten hammer is for 170 bar. I would try stock hammer and valve spring and put the valve knob back on max. Start the tune there. Mine ended at macro wheel 11 and micro 4.5 with the valve about 1 turn in from max. I know every gun is different but example tunes that work are still good info to see how other impacts turned out. Second reg on mine is 140 - 145 bar. With those settings I am probably 20 - 30 fps down from the plateau. That creates a situation along with the valve knob being adjusted to keep the valve from fully opening where the valve is being popped open and shut quickly. Thats the key from what everyone else has experienced. You dont want to be over powering your valve with slugs.

You still might not get good results. Its a weird thing cause so many people get good results and just about as many dont. I cant get my .30 to shoot slugs with a 1:16 slug liner. I only tried nsa but many people have great success with nsa.
 
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LDP said:
Mine worked at 150 bar with factory hammer. I would say at 145 bar and the tungsten hammer you are holding the valve open longer than it needs to be. I think the tungsten hammer is for 170 bar. I would try stock hammer and valve spring and put the valve knob back on max. Start the tune there. Mine ended at macro wheel 11 and micro 4.5 with the valve about 1 turn in from max. I know every gun is different but example tunes that work are still good info to see how other impacts turned out. Second reg on mine is 140 - 145 bar. With those settings I am probably 20 - 30 fps down from the plateau. That creates a situation along with the valve knob being adjusted to keep the valve from fully opening where the valve is being popped open and shut quickly. Thats the key from what everyone else has experienced. You dont want to be over powering your valve with slugs.

You still might not get good results. Its a weird thing cause so many people get good results and just about as many dont. I cant get my .30 to shoot slugs with a 1:16 slug liner. I only tried nsa but many people have great success with nsa.
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When I set my mk2 .30 (powerblock and 720 plenum? with the heavy liner I ran the reg at 155b hammer 3/4 of the way micro at 4.5 lines shooting 54gr h&n slugs at 890fpe they were moa and occasionally sub moa at 110yds. With the same settings the 49gr zans were going 940fps and were shooting moa to moa and half at 100yds and the hybrids were shooting about 980fps and I wasn't shooting those beyond 50yds but they were staking.
 
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JaceSpace1369 said:
Nice I would try other slugs just incase. I like the zan 49gr, 54gr and the h&n 54 the best
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I will eventually try some others in my .25 I have javelins on hand and I wouldnt mind trying H&N. I may get some different slugs other than nsa to try in the .30 but I recently bought a panthera in .22 so I dont know if I will be worried about having a .30 cal slugger.
 
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Gambler said:
How many bar does the factory hammer work up to?
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I used the same factory hammer on the .22 and .30 cal barrels I owned and ran the regs up to 165b. Never had problems, I think there maybe be too many factors running at once in your gun. Wrong liner, wrong hammer and it may be hard to diagnose where to go from here. If you really want to stick to .25 and keep trying, I would get the 1:16 liner and change the hammer to the stock one or even one of the huma hammer weights. Otherwise I would just go with pellets. I never tried the .25 on my impact, never cared for it specifically with all the other stories I read like yours.
 
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JaceSpace1369 said:
I used the same factory hammer on the .22 and .30 cal barrels I owned and ran the regs up to 165b. Never had problems, I think there maybe be too many factors running at once in your gun. Wrong liner, wrong hammer and it may be hard to diagnose where to go from here. If you really want to stick to .25 and keep trying, I would get the 1:16 liner and change the hammer to the stock one or even one of the huma hammer weights. Otherwise I would just go with pellets. I never tried the .25 on my impact, never cared for it specifically with all the other stories I read like yours.
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Ill put the factory hammer back on tomorrow.
And if the minus degrees work with me tomorrow morning i May be able to move my shooting shed out to my new range also :) its around 1500kg so need the frost to move it xD

20240317_120049.jpg
 
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