you can check the twist in any barrel with a cleaning rod with a brush attached.
insert the rod into the barrel. mark the rod where it enters the action with a fine sharpie.
also scribe a line on the rod top for about 1 foot. push the rod further into the barrel
untill the scribed line is again on top. then again mark where it enters the action.
remove the rod and measure the distance between the marks entering the action.
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