We had a big dead elm on the back side of the place. I'd put targets on it and shoot for many years.We had a tree with hatchet marks on the trunk (along with a few bullet holes) for years until it finally bit the dust.
Had two tree guys look at it, and neither one could tell me what kind it was. One was a certified arborist, but he looked at it during cool weather when it had no leaves. The other one said it could be from anywhere, and its seed dropped by migrating birds.
Still don't know...
One year it fell. Right where the targets were placed, several bullets were laying in the break.