I've always split my BBQ and firewood by hand, for many years. I've split all kinds of wood, Elm, Red Oak, White Oak, Water Oak, Post Oak, Hickory, and Mesquite . I thought I was tough, and could handle any wood, until now. I acquired some Live Oak, from a neighbor, who cut few trees down. They were cut to a manageable size, but still pretty heavy. I let it dry for 1 q 1/2 years, checking every 4 months or so, to see if it was dry yet. The stuff is still moist inside. So the hell with it. Out comes the 8 lb maul, for a 16 inch round. It just bounces off, with only a minor dent. I was able to split a few small thin rounds, but even that was tough. I bought a nice fancy Eastwing forged steel wedge. No dice, and bounces out. It bounced out so hard, and high, it jabbed my Bicep, and caused a good bleed. That forged wedge is sharp. So, next was the new style Diamond Shaped 4 Way Splitting wedge. I pounded that thing in, about 4 inches, with the 8 lb Sledge Hammer, and it wouldnt go farther. this wedge was even getting very hot from all the hitting. Next, I broke out the 16 lb Sledge Hammer. 10 minutes later, it split. Wooo Hooo, I won. I think I will probably roll the rest off to the corner of my lot, and let the bugs eat it. This stuff is tough.