Most 06's do like the heavier bullets including mine. Most people get caught up in bullet weight but it is really a Sectional density/Ballistic Coefficient number as it relates to the twist rate. IMO all standardized 1 in 10 twist guns prefer at least a .250 SD/.400 BC bullet which is at least a 210 grain .338, 168 grain .308, 140 grain .284 and .277, 130 grain .264 or 120 grain .257.
The .243/6mm should carry a 1 in 12 twist for most of their bullets and the .22 calibers a 1 in 14 and back in the day they did. Going up or down a couple of twists inches is not going to negatively effect you that bad but will show a preference to particular bullets. Twist is the most expensive part of the tooling process so you can see why it is standardized.
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