Twist for a cast bullet

[cav has been]

I'm pretty much over 700's but I've got a yen to put a low buck 308 together specifically to launch cast boolits at sub sonic velocities. In the world of subs stabile heavy projectiles are king in my opinion. My question; What is the fastest twist I can use with cast bullets without "stripping" the lead out in the grooves in the barrel? Opinions, practical suggestions,and wild-ass stories of pending mayhem are welcome. S.

 

[Silverjay]

I run 230 grain lead in a 300 win mag. Barrel is a 1 in 9 twist. Don’t have the velocity with me, running it over 13 grains of red dot. Shoots very well.

 

[cav has been]

To my admittedly Bourbon fueled pea brain that would be either side of sub. at my DA. Really curious about your velocity. What mould are you using for the 230's?