I am getting an AIAW 338 lapua, built in 2003, that I bought off a hide member and I believe it is a 1:11 twist,but I would like to confirm. Does anybody know how to tell what twist the barrel has? Any info will help. Thanks.
Measuring the rifling twist rate in a rifle barrel.
To measure the twist of a barrel, use a cleaning rod, magic marker and a tight patch.
1. Make a straight line with the magic marker the length of your cleaning rod.
2. Start the patch down the barrel, stop and mark the rod at the muzzle and a mark on the muzzle.
3. Push in the rod slowly until it has made one revolution, this is verified when the line on the rod lines up with the mark on the muzzle, then make a second mark on the rod at the muzzle.
4. The distance between marks on the rod is the rifling twist rate in your barrel.
