If you get the chance, shoot it a little more. Confirm that it is hitting where the first shot went. I would get it hitting on-center horizontally, and be 2 inches high at 50. With a load of at least 80 gr, you'll be good out to 100 yds.

It doesn't sound like you have much muzzleloading experience, so be careful to clean the gun thoroughly. Then, when preparing to hunt, be sure to get all traces of oil out of the bore/bolster. Load her up and get yourself a deer with your new gun.