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300 NM twist rate question

Gun_Guru

Private
Minuteman
Jul 16, 2018
44
16
I'm building a long range hunting rifle and have decided on 300NM. I have a manners EH1a. Defiance deviant hunter LA 750 bolt face. Im planning on useing a Proof research 26" Sendero . What would be the optimal twist rate for running the 215 and up?
 
I tried 9.4 twist 26 for 215 it was ok but my 24" 1/10 way more accurate.. both proof research..unless the other smith is better than the other.or jgs reamer (30° improved 156 fb )is better than the ptg 35° 235fb.
Here's the 24" 1/10
20180805_084724.jpg
 
I’ve got a 1:10 twist on mine and shoot 225 gr Hornady and 230 gr Bergers extremely well! Can’t say that the 1:8 or 1:9’s would improve it much if any for mine.