Murph999,
I have a good bit of experience with deer shot with a 30-30. An unpusheddeer hit anywhere in the vitals with a 30-30 will go no farther than 75 yards. Here is my formula:

Shoot, wait 15 minutes, go to the spot you believe the deer was standing when you shot. Find blood, and follow it to the deer. 75 yards is the long track with most being under 50. 3 floundered and died under 10 yards.

I would recheck the zero on your rifle.

C. Davis