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That's a bit odd, because a twist that will stabilize 52-gr and up is more than fast enough to stabilize lighter ones. Usually, the shorter the bullet the slower the twist needed.
I suspect a harmonic problem or a throat configuration that make that rifle prefer heavier bullets.
I have two Rem 788s in 223 that are that way. One of them likes any bullet weight I feed it. The other sprays anything under 55 grains all over the place. But it'll snug 55s or 60s into bug holes.
Fortunately, the one that shoots light bullets is my PD gun where I shoot all 50-grainers, and the other one is my coyote gun where I'd rather have a heavy bullet. If it were the other way around, I'd have sold both of them by now.
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