Slugging new .177 heavy barrel

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Nice feedback and sharp observations there. Yup something is going on with twist rates on heavy liners not being so heavy lately. I don't know if it will affect negatively the longer barrels but just like the .22 cal 800mm heavy is now 1:18 instead of 1:14 i would expect the .177 to be twisted more aggressively. The very minimum would be theorically 1:16 (sf 1) and ideally 1:13 (sf 1.6) @970fps for the zan 20gr slugs length. I would be excited with even 1:10 for testing even longer slugs or shooting slower.
 
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I am waiting on the .177 heavy liner just for the long ones and if they aren't up to task i may send it back. Of course twist rate isn't everything but theorically is a key feature. For the current fx blocks mag lenght limit .177 can have the better bc providing the bullet will be stable and the gun capable of feeding enough air to it and of course the barrel have enough twist to stabilise it.
 
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Yes i dont get it either, if the heavy are the same twist rate as the regular why even make a heavy liner, as i see it i have pretty much just lost 100 dollars here.
And my Rifle are in for repair so i cant even test it right now.
I am not going to send it back to krale before i have tried it, and if i have used it i dont think they will accept it back

Pretty depressing.

PS: If the twist rate had been listed at krale, i dont think i would have gotten the barrel, cuz when it is the same as what i have why bother as it cant possible be better, unless there are some secret sauce, but i dont think thats the case.
 
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Ignoto said:
Nice feedback and sharp observations there. Yup something is going on with twist rates on heavy liners not being so heavy lately. I don't know if it will affect negatively the longer barrels but just like the .22 cal 800mm heavy is now 1:18 instead of 1:14 i would expect the .177 to be twisted more aggressively. The very minimum would be theorically 1:16 (sf 1) and ideally 1:13 (sf 1.6) @970fps for the zan 20gr slugs length. I would be excited with even 1:10 for testing even longer slugs or shooting slower.
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This is indeed a bummer and why I changed my order for NSA slugs from 38 grain down to 35 grain. I was a bit disappointed by the 1:16 TR on the Superior heavy liners, even with the 35 grain with TR of 1:16 at 1000 fps the SF is barely 1.55, granted I suspect the 38 would shoot ok at just under SF of 1.4 but I need to really push the gun hard. It is better to have SF higher than needed than below ideal, it’s not easy to over spin the slugs.


I’m disappointed at FX and for OP for regarding the 177 superior heavy liner with such low TR. hope FX will listen and change that.

@FX-USA: can we PLEASE get a 177 heavy liner with TR of 1:12? Or at minimum 1:14. PLEASE?
 
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qball said:
can we PLEASE get a 177 heavy liner with TR of 1:12? Or at minimum 1:14. PLEASE?
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Or at least remove the heavy liner as it is just a regular liner, at least in regard to TR which i assume is the main factor in regard to accuracy.

I will rethink my situation in the coming weekend as i very much doubt i can do the 1.5 hour long drive to the shop to pick up my Maverick tomorrow.
I will also take a talk with Krale tomorrow in regard to my options, CUZ on the face of it i am tempted to try the new barrel, but from a technical point of view why even bother when it is the same as the 700 mm barrel i already have ( STX superior )

I am very happy i have not acted upon my limited collection of 16 and 20 grain slugs, and ordered a lot more of those in anticipation of being able to shoot those soon

Mind you. One of the South African boys do shoot 16 and 20 grain H&N slugs fine ( .177 ) in his impact with the regular barrel ) but i have tried 16 and 20 grain Zan and 16 grain H&N and i can not get any of those to fly like the south African can, even if i also use his 150 BAR on the regulator.

Part of this i think might be in him using a .22 Impact, with a .177 liner and probe,,,,,, and i think spring and hammer maybe vaslve return spring are different in a .22 gun, or at least VS my Maverick,,,,,, which is also why i have gotten heavier hammer weights to try in my Maverick but that also did not help.

I think me wanting to shoot slugs / getting a gun made for that very thing, i be wise to lean back and actually see that proven with a factory rifle, VS all this silly add-ons that might or might not work as intended.

I am very interested in seeing what weights the .177 halo slugs will come in, i assume unlike most other calibers they will NOT come in different diameters, as that pretty much seem to be the norm no matter what slug brand you look at in regard to .177 slugs.
 
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Halving a 100 M group, of a okay setup FX rifle, this mean that on 100 M if the wind are not ugly, you WILL for sure hit a ping pong ball in every shot if you are a good shooter.
Right now with the regular STX superior barrel i will for sure hit a tennis ball at 100 M with every shot.

So accuracy wise i think its not bad, my main wish going heavy ( barrel ) was to have the ability to be able to also some times shoot 16 and 20 grain slugs.
But generally like it is now i will shoot 12.5 - 13 - 13.43 and 15 grain slugs, and i do that just fine and it do seem that the heavy barrel will bring a little more accuracy.
So its only the matter of shooting the very heavy stuff, that are still unresolved it seem, but it will of course be one of the first things i test once i get my maverick back from the dealer.
Mind you it is damn cold here now and it do have a effect on my shooting / accuracy, if that is the gun being cold or my outright hate for cold and discomfort i can not say.
 
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thomasair said:
As a pretty much absolute rule….you will never get the best performance from a barrel that has a tight section at the breech. You may get ok (very subjective) accuracy depending on your expectations…. but it would be certainly better if that was removed.

Mike
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Is this true for diabolo pellets too? I thought a slightly tight leade was good for shaping the skirt and aligning the pellet with the bore.
 
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If i understand your leade in right, it is the same as chambering in powder burners, Also called a throat as i recall.
But yes the heavy barrel i can drop a 20 grain pellet into and it is flush with the end of the barrel, doing the same on my regular STX superior barrel the 20 gr slug stick out 1-2 mm.
So i am expecting the heavy barrel to feel better chambering / shooting the heavier slugs

I am not so well versed in shooting and gun making to know if there is a name for the very first part of the rifling, or there are anything that can be done there to improve accuracy.

My caveman bran tell me that the optimal bore / rifling in a barrel would be ever so conical the entire length of the barrel, but that are probably me over simplifying things.
It would also be easy to convince me that once a rifling have fully engaged on a projectile, nothing more need to be done there other than keep that going to maintain the spin until the projectile leave the barrel.

BUT ! all i know is from reading more or less illicit books way back before the internet, when it come to weapons it is a kind of "freedom" that Danes in general can not be trusted with.
 
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FX TR.jpg
 
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