Yes, an adjustable block would help with the brass, but I bet it is still ok, and will be reloadable.
The deflector will wear…. this is .308 and the brass is coming out at 3x the force of 5.56… not a big deal.
My personal experience with Winchester ammo is cheap.. cost and reliability, accuracy…. Federal has been my favorite factory ammo, then Black Hills, and Hornaday.
Once you start shooting for accuracy, start using heavier bullets, it'll be more accurate with the 1-10 barrel. I may have Federal GMM I can help you with once you come out here…..