Short 308win barrel twist rate for subs/why no fast twist 308 barrels?

[beetroot]

Been looking at getting a short 308 barrel for a little while with the hopes of running subsonics for plinking/fun/limited hunting, but still shoot supers.
Looking at posts on here and playing with the Berger stability calculator, it seems like a standard 1:10/11/12 twist barrel are capable of handling subsonics, the 1:10 being the best candidate but all able to do it if you choose the right projectile.

However, I can't help but wonder why 1:8 twist barrels for 308win aren't a thing, especially shorter barrels.
1:8 is more or less than standard twist of 300 Norma, so there is obviously no risk in a short barrel 308 over spinning bullets.
Running the numbers on a 110gr bullets @ 3000fps in a 1:8, the RPMs are 270,000 which is getting up there but still comfortably under the 300k magic number.

If I'm going to get a 16-1" barrel spun up and want the most versatile twist possible, what should I go for? Stick with a more standard 1:10, or go faster to a 8 or 9 twist?
I'm dream (probably a pipe dream) would be able to comfortably run subsonics, 125gr TMKs and 168-175gr SMK/TMKs.

 

[sparky702]

Been looking at getting a short 308 barrel for a little while with the hopes of running subsonics for plinking/fun/limited hunting, but still shoot supers.
Looking at posts on here and playing with the Berger stability calculator, it seems like a standard 1:10/11/12 twist barrel are capable of handling subsonics, the 1:10 being the best candidate but all able to do it if you choose the right projectile.

However, I can't help but wonder why 1:8 twist barrels for 308win aren't a thing, especially shorter barrels.
1:8 is more or less than standard twist of 300 Norma, so there is obviously no risk in a short barrel 308 over spinning bullets.
Running the numbers on a 110gr bullets @ 3000fps in a 1:8, the RPMs are 270,000 which is getting up there but still comfortably under the 300k magic number.

If I'm going to get a 16-1" barrel spun up and want the most versatile twist possible, what should I go for? Stick with a more standard 1:10, or go faster to a 8 or 9 twist?
I'm dream (probably a pipe dream) would be able to comfortably run subsonics, 125gr TMKs and 168-175gr SMK/TMKs.

I run some winchester 168 grain open tip's subsonic in my Remington 700 308 20 inch barrel 1/10 twist and they flew pretty good I zeroed at 50 yds and was dinging a reduced size target 12 " x 20 " at 200 yds pretty easy . It's like a mortar barrage . I am fixing to try some 190 grain sub-x hornady's I have a couple hundred bullets a can of trail boss and plenty of primers . My initial intent was to load a bunch of sub's for my 300 blackout rifles but as usual somebody on here commented on loading the 190's in a 308 so that will happen some time in the near future .

 

[Overwatch260]

Years ago I ran a 16" 10 twist .308 with up to 208 gr AMAX & 220 gr round nose subsonic loads with Trailboss powder, they did great in that twist rate. I personally think you'd be fine with a regular 1:10 for what you're looking to do @beetroot .