if you want the meat really tender:
hang it for 2 days, then let the meat soak in buttermilk sold in tesco for 3 days, it will look gross when you take it out, but wash it off and that nasty membrane that covers the meat will have turned into cotton wool and the meat will be very tender, the natural enzymes in the butter milk start to break down the meat, and tenderizing it!!!
i learned this is south Africa when i stayed with a PH or a long weekend, they soak all their tough game meat out there!
i tried a direct comparison of wildebeest, that had, and hadn't been soaked, the diff