Anyone have any shooting data on the X Barrel

[Drumsnguns]

I recently bought an x barrel upgrade for my gen 1 Impact. I just installed it and am shooting using the tuning for my ST barrel. It’s shooting a bit slow but is gettin me about 1.2-1.7” groups at 100 yd. 



Does anyone know what velocity this barrel likes and reg settings shooting at Mine is around 810 fps at 120 Bar with MK II

Thanks

 

[PerkyVal]

When I put the x barrel on my .25 Impact, the fps actually went up

 

[Bob_O]

I installed a Huma at the same time as my X liner (Wildcat 25) so I can't say if there was a difference in velocity. However both barrels are very accurate.

With the X liner, I'm shooting the 25.4gr JSB pellets at 953fps and getting a hair over 1" group at 100 yds.

 

[Drumsnguns]

My ST barrel shoots faster becuase Ernest enlarged the transfer port. I have it set for 830 fps for MKII. 

If it ever stops raining I’ll get out and start tuning. 

 

[FukoChan]

Here is my chrony results. Would love to see yours if you can make it. Velocity consistency is the hallmark of good accuracy. You will notice a flier in your groups(.25-1inch flier from zero) when the fps deviates more than 20 from your average/target fps. 

Start there and then, tune for accuracy and maximum efficiency(+ harmony). Then finally utilize different length smooth twist x barrels and see which barrel is best.

Last resort is lapping and polishing the barrel.

https://www.airgunnation.com/topic/daystate-mct-versus-regulated/

 

[Drumsnguns]

Bob_O, I shot at different regulator settings yesterday and got a very nice just group just over an inch too at 100 yd. So staying at 135 bar for now. I set the hammer strength for that bar setting and I'm getting an extreme spread of 10 fps. and that's at about an average speed of 855 fps. with JSB Heavy MKII.

Hoping that this will be a good place to stay at. More tuning as the weather improves, I'll post my chrony numbers soon.



KP