Hi , I need help I have been trying to load Wolf brass case 6.5 Grendel cases wont except Fed. large rifle match primers they seem to be to big and small rifle primers seem to be to small . Any help would be appreciated .

Unless they are some special product that’s meant to be non-reloadable, they’re either large or small, probably large if they looked like they’d fit. Not uncommon for primers to be a little tight. Chamfer the pocket and/or try another brand if you have any.
You might want to measure the ones you removed and compare to the new ones.

Keep an eye on the Starline site. Sooner or later they’ll have brass available; all SP IIRC.

Starline's 6.5 Grendel brass has been good for me. I neck it down to 6mm and it seems to be good stuff.

I bought some Prvi Partizan 6mm Remington brass about 18 months ago, I guess. I cannot seat primers in it without swaging the pockets (I don't care to cut the primer pocket with a chamfer tool). I was luck enough to find the correct tool somewhere for the job...at least it was correct after a little machining.