YeahI completely agree with all of your points and I have the whole time. I don't know what kind of recoil that thread starter can handle, but i just wanted to make sure he had all the options, from small to large.

Basically it just comes down to what caliber you can handle, and feel comfortable with. If you can handle the .338-378 then why not go with it? If not, then yes I'm sure a smaller .300 caliber will work just fine.