Low pressure laods will cause a form of case denting, but it wouldn't look anything like those. You would see serious eveidense of gas leaking down the body of the case and the dents wouldn't be sharp or pronounced, it would look more like it was pushed in, more like a lube dent looks.
As for loading those, I would as long as the case hasn't been cut into, and will chamber after resizing of course.
GS