My old(&late)hunting buddy had a Ruger M77 in 6.5x55. It had a slightly oversized throat and standard 6.5x55 dies would not size the necks small enough to hold a bullet.
My Bonanza Bench Rest 6.5x55 dies, did, however the expander plug barely touched the necks when the case was withdrawn. So, the brass had very thin necks. I do not recall it's make- might have been Norma.

Ripp - that Sako is a peach.