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Asymmetry is not unusual The Welsh sow had 16 to 17 pairs of ribs compared with an average of all British pigs of 14. http://wgpublications.com/index.html?ref=news&sid=224&action=view&show=25 I hope that helps.
I used one once, seemed to work ok, but I didnt like cutting the ribs in half. Id use mine again if I really needed to do more than 4 racks. On my small WSM I can easily do 4 racks of bb's without cutting them, and still have room for some sausage, ABT's, beans, etc.