Should be 1:12, but why not just measure it? Pretty simple. Put a patch on your jag and insert the cleaning rod from the rearjust past the chamber. Measure the distance (in inches) from the handle of the cleaning rod to the back of your action. Put a chalk mark or something you can see on the rod near the handle and push it into the bore until it makes 1 full revolution. Measure the distance from the handle to the back of the action again. Subtract the 2nd measurement from the 1st and that's your twist rate.