100-150 yards would likely put you firmly in the wheelhouse for a TTSX. At that velocity they are doing what they were designed to. And you don't see a lot of people disputing their performance at those distances. 500 - 1000 yards (if that's what they were shooting at) not so much.
He's got more than enough capability in a 300 rum with 165's at 500+ yds. I'd have no issues shooting 150's at same distance with 7RM.
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