Amanofbeer, I am a wood worker as well and have used American Oak from shop scraps. Normally American Oak is reserved for bourbon and other spirits as many consider it too strong/harsh for beer, preferring English, French or Hungarian Oak, but I had good luck with it on a big porter. I used them again (assuming they are a bit milder the second time around) on a big ESB and I love the affect. I can't tell you anything about hickory.