Twist rate question.

Win Mod 70

Well-Known Member
Anyone know where I can find the twist rate for two of my rifles? Both are Winchester Mod 70's, 24 inch barrels and post 64's. The fist is a 243 sporter and the second is a 308 Coyote Lite.
Once I have the twist rate how will this influence my choice of bullet weight when loading (for deer) ?
 

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