If you have a tape measure, a cleaning jag, a patch, a bit of masking tape and a pen you can measure the rate of twist in your barrel.
It's best to lightly oil the patch and then run it down the bore with the jag on a cleaning rod until it hits the bottom.
Wrap a piece of masking (or magic) tape around the rod right where it sticks out of the muzzle.
Use the pen to make a mark on the tape that is in line with the front sight.
Slowly withdraw the cleaning rod, jag and patch allowing it to turn with the rifling twist.
Continue to do this until the mark has rotated 1/4 of a revolution, or better yet, 1/2 of a revolution.
Your sight mark should have moved from the 12:00 o'clock position to either the 3:00 o'clock (1/4 turn) or to the 6:00 o'clock position (1/2 turn).
When the mark has reached one of those positions, measure the distance from the face of the muzzle to the lower edge of the tape.
If you used the 1/4 turn method, multiply the distance from the tape to the muzzle by 4. That is the rate of twist.
If you used the 1/2 turn method, multiply the distance from the tape to the muzzle by 2 to get the answer.
There is always the possibility that the patched jag might jump the rifling so it is best to do this test several times and take the answer that repeats.
