I am assuming that you mean 6mm dia. and not 6mm-Rem. This 5 shot group was fired at 100 meters (111 yds) from my Savage 12 wearing a CBI 28" 1-8" twist in 6BR Norma. These are 58gr V-Max (dang close to 55's). This group measures .321" Center to Center, and was shot while breaking in the barrel, and hos done this sized group many times since. This barrel and bullet still shoots under .5 MOA out to 330yds (furthest I have tried grouping it so far).
And below is the Rifle for those who are interested.
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