In archery terms "hits hard" is hard enough to get a complete pass through on a good sized deer at acceptable ranges.
Last deer my FIL shot last season with his crossbow was a good sized doe. Probably 120lbs live weight. He hit her a little forward of the sweet spot and drove the bolt through both shoulders. He had an entry and exit wound but never found his bolt.
About a week later when we picked her up from the processor the processor says, "Oh by the way, I have something for you" and pulls out the last quarter of the bolt with fletching intact. It was the only thing left after smashing through both shoulders. We didn't find it when field dressing her as it was in the meat of the offside shoulder up under the hide. Front 3/4 or so of the bolt kept on trucking and we never found it.
She ran about 15 yds from where he hit her from a 35 yd shot.