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FX Crown MKII .22cal twist rate

There is a large variation of liners, with different twist rates also amount of choke. The naming is confusing lately.
I have four liners in .25 for example (and two in .22), two Superiors (x600 and x700 lengths) probably from different - over a year time stamps, and the choke amount is different I measured with push through slugs. I didn't investigated deeper but assuming these were different PN's.
Pull out the liner and best to measure the TR, I would suggest don't try to memorize the names but look up the PN (part numbers).
 
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