Apologies...I had only scanned the first page when I posted. Having re-read the entire thread, I was redundant.
I would observe, however, that you got very good advice to take a hunter safety training course. I would also suggest you become familiar and practice a good bit with the M1 Garand before using it for field use. Finally, I'm a big believer in appropriate and accurate shot placement. I would not regard "knocking the deer on its ass and breaking its spine" as a useful targeting approach.