Use your cleaning rod. Put your bore brush on or what ever gives you the tightest fit. Push it in a little and mark with a permenant marker. Make a mark on the rod and the handle to give you a start and stop point. Start at the muzzle end and becareful not to mark your lands. Once you've inserted the brush about an inch into the bore, make a second mark right at the end of the muzzle on your cleaning rod. Push the rod in and watch the mark at the handle. Keep pushing until the mark spins around and line up again. Make another mark at the muzzle. Pull the rod out and measure between the two marks you made at the muzzle. What ever the distance is, that is the twist of the barrel. Make sure the rifle is stationary and can't push away from you while you are trying to push for measurment.
Tank