My 20 BR is a 12 twist
The 40 grain Berger is an awesome bullet for what you want and it is also what I use to wring out what a gun is capable of accuracy wise.If it was me I would choose an 11 twist just to make sure if you ever wanted to try 40 V-Max’s on pd’s you would be fine.Probably not needed but at your altitude it might be prudent.As far as velocity 4000fps is a walk in the park for the BR and a 40.The best group I Shot in competition was 5 at 100yards of .212”with the Berger,glad it is still available.
Matt
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