Short barreled 300 PRC

I have N570, H-1000, and Retumbo, Also 215gr Bergers , 220gr ELD-X and 230gr A-tip. Something should work !!!!!!!!!
 
Thinking about a 20" or 22", will I need a 1:8 twist to make the berger 245s work or will a 1:9 be ok?
 
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