Originally Posted by Blacktail
sorry for the delayed response I talked to the guy i bought it from indicated a 1 in 10.
1:10 is extrememly slow for 6.5mm and you may have difficulty shooting heavier/longer bullets.
I recommend you measure it yourself.
Put a reasonably tight fitting patch on a cleaning rod with a swivel handle.
Start the patch through the breech.
Use masking tape and a sharpie to make index marks on the rod/handle such that you can run the rod in far enough so that it makes exactly one 360 degree rotation. then, measure how far the rod travelled. That distance is your twist rate i.e. 1 full turn in x inches.
Repeat several times to make sure you got a good reading.