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The old slow twist .460 wby rifles exhibited some really poor penetration. Wby went with a faster twist, and it seemed to help. Maybe they also went with thicker jacket bullets too at the same time, I don't know.
Yes!
Weatherby back in the FN Mauser days did not get the twist correct. I had a 270 Weatherby on a FN action, built by Weatherby. Twist was 14 inches. Would group poorly with 130 grain bullets and 150 grain bullets would do a shotgun pattern. Put a 10 inch twist barrel on it and solved the problem.
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