qball,
Measure the actual twist rate INSIDE the liner(use cleaning rod/wood dowel with tight-fitting patches). Sometimes the exterior twist lines aren't correct.
Always shoot the liners to judge them. 2 of the 4 STX liners I own didn't have the correct twist rate. One of them(not very accurate) was gladly and quickly replaced with liner which had the "listed" twist rate by company which advertise on AGN. The other was the best shooting pellet barrel I have ever owned, even though it is NOT the "listed" twist rate. All 3 of the Superior liners I own have the listed twist rate.
Below is a pic of the receiver end of a Superior STX next to a regular STX(slug A) liner. Notice how the exterior twist lines stop BEFORE reaching the breach end on the regular STX(slug A) liner. I don't know if all STX liners are like this or not, but it MAY be an indicator.
i don’t think the inside twist rate could be different from outside line since the inside twists are pressed in from outside. At the end of the day it has the same exact twist rate as my STX liner so there must be some sort of mistake. I’ll reach out to FX for validation also.
my 22 superior liner and my .25 700mm slug liner clearly have different twist rate compared to my STX liners. The slug liner easily measure the twist rate to be 1:21 using the same method of tracing the outside groove.
the fact the seller has not replied to me in 3 days is also pissing me off.
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