Anyone know much about a CVA Scout 350 Legend rifle?

Does anyone know much about the CVA Scout — 350 Legend single shot rifle?

So, I've dug one of my late pawpaw's guns out of the cabinet. It's one of two muzzle loaders I inherited from him. Neither is very old, or very rare, or very valuable (except for sentiment). This one, the nicer of the two, is a CVA Missouri in .50 cal with double set triggers. I've never fired...

I'm trying to find a picattiny scope base for my CVA hunter 308. I found a couple of them that didn't say specifically hunter but does anyone know what I need to be looking for to make sure it's compatible? It has the factory mounts on it now and I need something for picattiny. Thanks in advance.