.308 1/12 Twist bull barrel for a Texan

I am building a custom .308 texan and the only barrel I can get is a 1/12 twist 32 inch length. Can someone please advise me if this twist is to fast for 120-150gn slugs. Also running AAO 4500psi setup.
The factory 308 barrel will be enough for 145gr to 155gr long bullet that one is 1-14 .. for bullet in the 120gr+ Doug said that 1-18 to 1-20 would be better suited for light bullets.. remember to use one last solid aluminum bushing in the end of you frame .
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