The twist rate of the Valmet 412 .222 barrel is 1:14 (1 twist every 14 inches).
I found this out by using the cleaning rod and a patch. I used a highlighter and made a mark down the rod, then I stuck the rod in the barrel until it made one revolution. The distance the rod traveled was 12 inches, I conducted the test several times and found the first time I was in error.
Doug