Your telling a sawmill owner what wood is used for barrels. Ha! FWIW, I am a life long wood worker, retired tech educator and best described as "wood poor", i.e., I have the stuff laying everywhere. We also own/live among our own timber. I have zero interest in making a barrel, I'm asking about placing oak in wine during processing. Your last two sentences are what I was after, thanks! I see oak in some recipes, not others. All about how much tannin taste ones after? FYI, White oak as a species has closed cell structure which allows a barrel made from that tree alone, to hold liquid well. There are mills in my state, KY, that specialize in sawing stave wood and we do have one barrel plant near me- google "Independent Stave Company" or Morehead Wood products to see whats near me.