Okay, so here's my situation. My dad friggin' loves wine. Good wine. He's set on aging some of the Pinot Noir we'll be making in oak barrels. My question is this... If we are to be making 4 cases (approx. 12 gallons) is it necessary we buy an oak barrel thats EXACTLY 12 gallons? Can we get a bigger one and age it with extra space in the barrel? Thanks!