Prvi is pretty good stuff. Save your brass. If you don't end up reloading you can sell it to someone who does to help offset the cost of buying more ammo.
Don't worry about groups at 100 from the bench, if you can hit a paper plate at 100 yards consistently from a standing position you are ready to hunt. Groups from the bench are nice to post, but you'll not have the bench in the field. However you might have a rest (shooting sticks, log, tree trunk, whatever) if you are lucky.
Machine guns are awesome until you have to carry one.