Contact Ruge for a correct answer.
1/10
1/10
IIRC, 1 in 10
1 in 14"
1/10 IIRC
If it's an older gun it's likely 1:14 twist. Most of them were.
The Ruger Model No. 1 in .243 caliber typically has a twist rate of 1:10 inches. This means the rifling makes one complete turn every 10 inches of barrel length. This twist rate is designed to stabilize the common bullet weights used in .243 caliber, optimizing accuracy and performance. Always check the manufacturer's specifications for confirmation, as variations may exist.
According to Rugers web site the twist on a Ruger Mini 14 Ranch is 1:9' RH. But I believe that changed from 1:10 to 1:9 in the mid 1980's.
You can measure the barrel yourself if you have it, using a steel tape measure. You can also contact Ruger Customer Service through the Ruger website. There is no published data that gives the barrel length of each firearm made by a given company, only the standard configuration for a given model- and THAT varies.
Ruger did for a time have min-14's in 1:7 twist...no longer. But they made enough of them, that they're "findable". The serial numbers are approximately: run start: 1989: 185-56000 or for the Ranch Rifle: 187-84000 run finish: 1994: 186-35000 or for the Ranch Rifle: 188-75000
Oliver Twist.
S and Z twist are two types of twist given to yarn. Before giving twist fibre /roving strand has to be parallel so that either twist given is not affected. Either of twist is suitable but in practical applications Z twist is given to yarns either be knitting or weaving.