Anyone care to share some info? .. Lothar polygonal .25 barrel.

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I slugged a .25 700mm non-choked LW poly barrel and got .254
Does anyone have experience with this barrel ?
It's called non-choked but does have a very slight choke near the muzzle.
I think these are used in quite a few airguns including the Epic Two and Taipan?

 

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Turns out it's the CZ barrel for some reason.