Charges can be different of course. The closest I came was from a scrub bull but he didn't actually know where I was, giving me time for a quick reload of one barrel (he had stopped running and was perfectly positioned to knock over so I judged one round would do it), having expended two on him before he came down the hill. The big tree trunk I was hiding behind also was handy, to hide behind and also to keep him on the other side of it if he did realise where I was.