the two are unrelated. I have a S2 in the 15000 range in 223. with 69's will NOT hit paper @ 100. According the Weatherby the older ones were 1:14" twist.
"Hi George,
Thank you for contacting Weatherby. We changed from a 1-14" twist to 1-9" twist starting with serial # VB084281. All other serial # prefixes V, VX, VS, etc. will be the 1-14" twist.
Thank you,"
BUT ... I asked about rebarreling services and they said they'd knock 25% off the price to get 1:9" barrel installed. $240 for a CM & $320 for SS (of course I have SS.) $600 for Pac-Nor (plus shipping. But I could get a 1:8 or 1:7" too. I don't really want to shoot more than 69's through this rifle. All three of my AR's love 69's.