In my experience- most Blackpowder hit deer don't bleed out well unless its a double lung shot. I don't think you mentioned your load - I use a .44 XTP Pistol Bullet with a sabot - and a couple times over the years - I in general - 've had very poor blood trails high shots but found deer within 100 yds.

Hopefully the shot was over the spine - and if so - the deer will heal up without a care.

FH