FX slug liner alternative

I don't think these will work, 1st the caliber is wrong a .22 air rifle and .22 rimfire are not the same.

2nd the FX Liner is a floating liner it is actually a barrel (even though it's being called a liner) these liners that are being sold are designed to be pressed into a old barrel to referb it

3rd not trying to sound crass or disrespectful but if I spend that much money on a gun I'm not going to risk messing up my breach block with an unknown entity

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Willie, 

Not sure where the message was missed but these liners would be to shoot .223 bullets , not pellets . I get that these are designed to be pressed into an old barrel but they are in fact the same dimensions as the existing X liners in OD which means they will slide into the already machined barrel sleeve just like the FX liner , no difference . As far a messing up a breech block , I just don’t see how this would . I’ve got a few on order and will gladly post my findings once I have it fitted . 



There will be some machining needed , cut to length, crown , cut the leade. I’ve got quite a few .223, .224 and .225 molds that I plan on shooting from my Impact X and right now the FX liners are .217” for both “slug and pellet “ which simply adds to much sizing to get them down to the right diameter. 

Here are a couple examples of where one could buy .223 “ cal lead ammo . I have used both and they shoot great from an Evanix K550 but haven’t tried them from the impact due to the barrel specs . Like I said I cast my own using only NOE molds . 

https://northamericanarms.com/shop/parts/cbb1/



https://www.krale.shop/en/airgun-pellets-rws-5-7-mm-41-4-grain.html

With minimum machining these would work. I've always wondered how a .22 jacketed round would perform in an Impact or the like.

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I doubt a jacketed bullet would work at our relatively low pressures . I dont know if it’s ever been tried so I can comment any further on that . 

I’ve got a .223 chamber cutter and a lathe to do the prep work to the barrel once it gets here . I have yet to do any real chrony work on my Impact but I’m hoping for 60fpe with the possibility of adding a plenum extension . The guys at JSAR are testing pretty much the same idea only using a TJ’s barrel ,so I know I’m not the only one that thinks this is doable . 

Got the Impact ready for the new barrel as far as power goes . Got the porting straightened out on the brass sleeve and got the probe (pin type ) down to 1.8 mm . At 155bar I’m pushing the 25gn monsters to 990fps . That should be more than sufficient to push a 30 gn bullet . Now for the wait . 

Got the barrels today and went straight to work on fitting one to the FX impact. The barrels were both received in good condition ( thanks Knife) the unfinished length at 27 1/2” and an OD of .311” . First was to cut to length at 600mm , next was to cut a crown and last was to work the leade . 
The FX having a thimble makes fitting this barrel a real breeze and could be done with nothing more than basic hand tools . I polished the bore with a couple hundred strokes of both fine and ultra fine JB bore paste .I don’t think the barrel even needed it as the riffling appeared to be really well cut with no chatter marks ,smearing or rough lands . Not what I was expecting from a 40$ barrel liner . 
The barrel liner slid right in the outer barrel sleeve with a couple orings just like the OEM barrel liner . In the pics , you can see a step in the rifling but that was cut off as I suspect that was to show which end was to be the breech end . 
Now how does it shoot ? I did go to the closest shooting spot I have and ran some different sized bullets through. I was shooting the 225-39 FN GC ( from the magazine ) The initial testing shows some great promise . This will open up more possibilities for shooting a variety of cast slug shooter from the impact as there are quite a few molds from .222” to .225 “that will fit the new magazines . 

No reason it wouldn’t work. TJ’s have a .172 cal barrel in 1:9” twist with a .315” OD . Just need to cut to length and install it . Not sure about the Hornady jacketed bullet but until you try there no real way of knowing . 

Ok more testing done . Shot at 50 and 75 yards . Using the same 225-39 FNGC bullets at just over 750 FPS ( that’s all I can get out of the Impact) at 50 the groups were at 5/8” and at 75 we’re just over 1” . The groups are opening up a bit but I suspect it’s the slow speed I’m shooting them at not to mention I didn’t weigh or sort the bullets after casting . 

So if anyone has any 223 or bigger bullets they want to try from their Impact or other FX with the x liner system ,this liner seems like it’s the way to go . The might just have to get my Impact up to 60 + FPE to really see what the liner can do .