I have a 1/10 twist .243 and it likes 85-100 gr, mostly Nosler handloads. In factory ammo for a 1/12 you may want to try Nosler 85 gr BT. Or even 70 gr stuff just for the yotes, and it may be the most accurate.
I have some handloads that shoot better @ distance than they do on a target face @ 100yds so I see the same thing as you sometimes.
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