It means crap, and alot more. If a rifle is capable of 1" groups or less, then that's what it should be sighted in to do. There are too many other variables introduced in the woods not to go out with your best set-up. One inch off at 100 yards on the range can be a miss at 125-150 yards in the woods. One must consider rain, wind, elevation variances, changing sunlight, temperature etc, etc.
You owe it the animal to get your best group!
ORIGINAL: Deerslayer_37
Oh, and about 1" groups, I'll say this: For 95% of hunters, 1" groups don't mean crap. As long as you can for sure put the bullet in the chest area at the ranges you'll be shooting at, you're fine.
slayer