Tuning How much difference carbon liner sleeve and barrel tensioner make at low FPE?

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qball

qball

Member
Apr 13, 2020
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CA, United States
So it’s no secrete I love my FX and love Ernest’s carbon liner sleeves, but I still think it’s really for high power application. I ordered a 500mm .177 barrel for the crown and it works/shoots great. Out of sheer boredom I ordered a barrel liner sleeve for the 177 liner, when I was installing the liner I was surprised to see my 500mm barre is not superlite but normal STX, at first I was a little bummed because it’s heavier but soon I was overjoyed because it can put it my Dreamline or even impact. out of boredom again I ordered some carbon tubes to replace the useless shroud which is too skinny to be of any use and forgot about it because they took a month to show up. Got them couple of weeks ago but thanks to work I finally got around cutting one for the crown today.



I am fully convinced this is just me being silly and stupid over kill especially when I’m shooting whopping 6FPE, granted the goal is to shoot nsa 12.5 slugs at 1000FPS later on. Plus I love the looks of carbon to begin with. Cutting took no time and the fit is perfect on the first try!

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I freaking love it!!!



Not expecting anything beside looking cool I still had to shoot it of course. Then the damn thing is just pellet on pellet! By no means it was not accurate before but the pellets just seems to keep on going into the same hole! The pellets it had a little issue with is crazy consistent today. Weird I thought to myself and switched pellet just to make sure it’s not placebo affect or I’m just crazy. The other pellet always shot really well before but still seems a bit more consistent and then I realized that the left and right POI shift when I switch pellets isn’t noticeable like before. I am actually a little stumped, I did not expect ANY improvement in accuracy with the liner sleeve and barrel tensioner but there certainly evidence that suggests there is a difference even at the lowly 6FPE range. The crown now feels like my challenger or 1720T accurate at 20-30 yards. I always attributed the slight lower accuracy due to the super low power tune which isn’t the best for consistency or accuracy. 



Anyways, I’m very very surprised or even stumped because in my mind there really should NOT be any accuracy or consistency improvement! Will find more time to shoot more and see how it goes. Has anyone else noticed accuracy/consistency improvements with carbon liner sleeve and barrel tensioner at low power? This one got me scratching my head a little. 
 
Yeah i am not sure how much it will do, when i finally get my FAC Maverick i will first shoot it bone stock with pellets and see how it does, then i might try the carbon sleeve i have procured months ago.

Going that route first will probably also be better as i also have some ideas to harmonics tuning without paying FX more money, and it will probably be harder to see the effects of my effort on a more rigid barrel.
 
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I actually have a sleeve like this for an old standard smooth twist barrel off of a 1st gen impact. I'd like some way to really square it off perfect so I know it isn't pulling one way or the other. Just straight.

(old ST barrel here without sleeve)

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My .22 mk1 continuum was/is always pellet on pellet even at the lowest I tuned it at 15fpe. Well, using quality pellets, anyhow.... Using an older pellet liner/380mm superlight barrel. It bests or matches any other gun I own or did own (impact, another crown, several LW barreled guns, an HW, too)

Weird you received a non-superlight .177 barrel.... I may have sent it back... But seems you might have it sorted!

Almsot sounds like you received a dreamline barrel??
 
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@long_gun_dallas: very well could be, i don’t remember honestly but I thought Dreamline is also going to superlite to my understanding. At least my 300mm compact Dreamline barrel is superlite version. Either way I’m happy about it being STX because it can go to my impract also if I have the itch 1 day.

for the most part my crown in stock form is very close to pellet on pellet at 6 fpe and I know if I turn it up to 11-12 FPE or 750-800fps it’s dead nuts on consistent too. I attribute my 6FPE “inconsistency” or 1 out 4-5 as flyer to the fact my reg and valve is about as imbalanced as it comes due to my goal of 6FPE and mouse fart quietness. Well, on top of 1 penny pellets. if I use Hades it’s dead on at around 650 FPS. Again I attribute it to my tune and I’m fine with it. I’m just surprised my the consistency improvement by the carbon add on bits, did not expect any improvement till I push the gun one day. I’m mystified. 


 
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Hey, whatever works! Stiffening the barrel has a pretty pronouced affect on the gun's reaction to harmonics.
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absolutely! However I simply didn’t expect to see the affects at such low power level. After thinking about it more it is starting to make sense: at 600fps the pellet will remain in the barrel much longer than say 900fps so while the harmonic might be less pronounced but the pellet is affected more because it’s in the barrel a lot longer. I’m gonna have to put carbon tensioner on very one of my FX now…..except the superlite barrels.


This discover is fascinating! 
 
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My 177 mav improved with the sleve with pellets and most of all slugs shooting at 930 and 840. Im starting to believe the shorter the barrel and the longer the projectile is in the barrel the more time it has to move the barrel as it spins and in a 500mm barrel it doesn’t quite make 1 full revolution causing the barrel to kind of whip it out. Mi slugs are much closer poi as my pellets and i changed nothing else
 
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My 177 mav improved with the sleve with pellets and most of all slugs shooting at 930 and 840. Im starting to believe the shorter the barrel and the longer the projectile is in the barrel the more time it has to move the barrel as it spins and in a 500mm barrel it doesn’t quite make 1 full revolution causing the barrel to kind of whip it out. Mi slugs are much closer poi as my pellets and i changed nothing else
Click to expand...



Yes, the sleeve absolutely improves the FX barrel system. I have it on my 700mm .25 liner and the improvement is significant at higher power, the shock to me is my 6FPE power level because with so little power there is no harmonic to speak of……so I thought. Think I have proven myself wrong on this. 
 
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