I hit a new area where the old court house once stood in the 1800s now a school was built and dirt was move so I hunted it and first target was this a Minnie ball
No, minies can be fired from any gun, even pistols, but most were used in rifled muskets. Those tiny little grooves all around the circumference in the two grooves on your bullet are not marks from rifling, they are from the manufacturing of the slug and only occur in cartridge bullets from the late 1800s to now. The longer marks that go over the circumferential groove are the rifling marks.