Yep! A fellow up here barrelled up a silhouette rifle to 6.5 on the 8x57 case. No changes other than reducing the neck diameter. Spent a lot of dough on the reamer and dies.

A few guys wanted to know why he didn't just use the 6.5x55 case, as the case capacity was almost identical? He told them he did it just because he wanted to.....

He won no small numbers of matches using it, too. smile
Ted