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You can wrap a piece of masking tape around a cleaning rod, near the handle, with a couple of inches sticking straight out like a little flag.  Run a tight fitting oily cleaning patch down to the bottom of the barrel and note what position the tape is sticking out in relation to the barrel.  Then slowly pull the rod out of the barrel watching how far the tape turns when it reaches the muzzle.  This will approximate the twist (e.g., if the tape moves @180 degrees in a 33" barrel you are looking at a 1 in 66" twist rate.)