My local range is unsupervised. I need to sight in my M1 Garand at 100 yards. Instead of shooting a few shots, walking out there to see where, i hit, adjust, repeat...I was thinking about getting some binoculars so I can just see where I've hit on my target paper. What should I be looking for in binoculars. Obviously, I want to get a set that is good enough to see the holes in the paper at 100 yards. I was looking at cheap ones at walmart and bass pro shops, and they have like 8x21, 10x25, etc for $20-ish. What do the numbers mean, and what should I get?