Most Savage 243's are 1-9.25 twist but even if yours is a 1-10 it will stabilize a 100 grain bullet. A good place to start looking for White Tail loads is Nosler's load page. As you can see their barrel was 1-10 twist except for the 105/107 grain bullets. Good luck on loading and your hunt.
http://www.nosler.com/243-winchester
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