I haven’t read the whole thread but I would say straight off the bat that it is the sub-50m part that is your problem.
You need a bonded bullet or monolithic for that kind of range with a .270 as very few of the softer general-purpose bullets will hold together. Short range bush shooting requires a stout bullet construction. Regular cup and core bullets will struggle to stay together but even so they should at least push through on entry. Do you have any pictures of the entry wounding to get an idea of just how bad the problem is?
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