A number 3 contour is the standard for a factory hunting rifle. A number one contour is for manlicher stocks so you can fully bed the barrel to reduce whip.
You don't want to get to light a contour or the suppressor will cause the barrel to droop when it is on.
How accurate do you want the rifle? 2"-3" groups at 100 yards has been the accuracy standard for hunting rifles for as long as I can remember. Most rifles today will shoot better but it is all you relay need for everything but varmint.
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