mcrae555,
You don't need to buy a new shellholder.
I use the .308W/7mm-08/.30-06 size shellholder for American-made 6.5x55 brass. Both Winchester and Remington use the basic .30-06 size case head dimensions for their brass.
On the other hand, this shellholder will not fit Norma and European military surplus cases.
HTH
John