the replays are only about 1-3 megs each. Just delete them every week; I have a few beautiful gems of games that would've never gotten picked up otherwise.
If the type 59 is cresting, there's really no good way for him to shoot at you, the gun depression is not good.
Unless it's like the scenario like I said, where he's actually hulled down and barely crested so he's able to get a shot at you... but the general rule is if you can't see down the sights of his barrel, he can't shoot you. All of the shells are traced from the gun mantlet outward, not from where the barrel exits so you can't shoot through corners or through stone fences and whatnot.
Are you sure it's the type 59 shooting at you and not some invisible tank from beyond your range? If it's just the top of his machine gun poking out from behind the hill there's no way in hell he could've shot you.