anyone know the standard barrel 91 twist rate?
I don't know if it's 1 in 11 or not, but it's definitely not a metric vs. inches issure. There are 2.54cm per inch, or 25.4 mm per inch. Nothing that would get you to 1 in 11 anything that is equivalent to 1 in 12".I think my 911 is one in 11? metric versus inches? bob
Get a cleaning rod with a rotating handle (as most of them are), some patches, a marks-a-lot, and a ruler. Put a really tight patch onto the patch attachment and push it a few inches into the muzzle. If the patch is tight enough, the rod will rotate along with the rifling. Now draw a line around the cleaning rod right at the muzzle, and a line on the muzzle face itself that continues down the cleaning rod. Now from about 10" to about 13" up the cleaning rod, in the same orientation as the mark on the muzzle, draw another line on the side of the cleaning rod. Now just push the rod into the muzzle. Push it in until the second line on the rod aligns with the mark on the muzzle, meaning that it's made one revolution. Now mark a second circle on the cleaning rod and pull it out (or push it completely through, then remove your patch, then pull it back out.)How would you do that....Accurately?