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With an 18" barrel and an 85gr bullet, you're going to want a faster powder than most people will recommend.
4198, 3031, or RL-7 would be my starting options. 4895 is the slowest powder I would use. (that means 4064 is an option; 4350 is not; Varget is really borderline - I wouldn't start with it.)
3031 would be my preferred starting point. It has been "THE .243 powder" for decades.
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Don't even try it. It's even worse than the internet would lead you to believe.
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