I have spent countless hours helping people track deer who shot them in teh shoulder. If it exits, good blood trail, but with a 30-30, it might not exit. And then thats when the fun begins tracking. A non exiting shoulder shot will not bleed much if any. I have killed alot of deer with a 30-30, but there was a reason my 30-30 doesn't see much action and sits in the gun cabinet. Just alot of better calibers out there.

Now, I like shooting a 140gr barnes TSX from a7mm-08, and that bullet with that gun will always but always exit.