Does anyone out there have any loads for a CBI 223 8 twist 25in bull barrel. I have tried 77gr Nosler and Berger, 80 gr Nosler and can't get them to group worth a ****. The only bullet that groups well is 55 gr Berger match. Any contributions will be greatly appreciated. The only reason I went to the 8 twist was to shoot the heavier bullets but I can't seem to do it.