My first year splitting wood. Until yesterday I've used the Fiskars 4.5 lb splitting axe to further split some wood that was delivered to us but some was a little too big....mixed hardwoods and some split easier than others, but they all split with not too much extra effort. This past weekend I rambled into our woods and cut up 2 downed trees, 1 was a white oak(I think!) and the other a pine. The rounds are about 10 to 12" and the pine splits fairly easy(expected)...but when I took my first swing at the oak the axe just bounced off it(unexpected)! Even trying to start from the edges and work inward was a lot more effort than I anticipated! Do I need a particular approach to this or is there a reason the oak is so darn hard? I've resplit oak before(as mentioned above) and didn't have this. Tested moisture content and it's around 30% if that makes any difference? At this point I may just accumulate more wood and wait ti split it all with a rented hydraulic splitter.