I wish to buy a case holder for my Wilson case trimmer, but have a problem with choice.
I have cases for three other calibres, but for a 6.5 Grendel the site offers two choices, fired and un-fired and I'm afraid I don't comprehend this choice.

The cases are new Lapua cases in 6.5 Grendel, so I assume that they will be trimmed to the correct length? I'm unable to get the standard dimensions, i.e. max case length, max C.O.L. as my Pc is not allowing me to access some sites which have them, and that's another job rectifying that.

Assuming the new case is already trimmed to length? the company is saying that I need the un-fired holder, but if they had been fired , then I would buy the fired case.

My other calibres, 6.5 Swede, 223 Rem and 357 have just one case available, why two different types for the Grendel?