Thread: .500" barrels

Hi What would be the best twist rate for a 22" .50 cal barrel. I see Marlin and Winchester have a .500" S W M with a 1-24" twist rate so could be ok as they shoot pistol bullets, its a pistol cartridge. The .50 Alaskan is a nasty beast with heaver slugs so could go 1-20" to stabilise heaver slugs. So the question is if I was to make a .5!0" bore barrel for someone's project what twist would you choose.