Was looking at this caliber, why I don't know. Did buy a set of Redding 445 Dies last night.

Not a big fan of the heavy hitters anymore, but nevertheless I noticed something I found interesting. Thinking about a 15 inch Contender barrel with brake. Not sure what bullet weight I will use. MGM list the only twist available as 1/20 and Bullberry list 1/14 or 1/16. I understand the heavier bullets need faster twist but I found this odd. Opinions or experience with either would be greatly appreciated

Thanks in advance
Doug