GS for Chamber Casting

Hello All,

I recently inherited a bolt action rifle from my late grandfather and I'm having issues determining the caliber of the rifle. There are no visible markings on the barrel/receiver and he had a handful of different size ammo, 8MM Rem being the most common in the bunch (11 out of 18 shells). I used an empty 8MM casing and it fed/extracted with no issue however I'd like a gunsmith to do a chamber casting if the price is right. I'm in southern Beregn county and don't mind travelling to far, just need a reputable contact. Thanks in advance!

Also, sorry for the lack of pictures however I'm at work and can post pics later when I'm home.