95 gr Sierra and Berger boat tails, 108 BIB flat backs. Maybe 105 A-max, 107 Sierra's. IMO you would be better off going with a 8 twist barrel. I would also state that I would pick a 6BR over a 243, it is just better equipment.
Some good reading material.
http://www.6mmbr.com/6mmbr.html
http://www.6mmbr.com/6BRImproved01.html
http://www.6mmbr.com/243Win.html
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