Once upon a time (in 2014), I brewed an all hop stand IPA. 4oz Cascade, 1oz Columbus, and 1oz Simcoe in a 30 minute hop stand, stirring every 5 minutes. Then, I dry hopped with an ounce each of Columbus and Cascade. According to Beersmith, the calculated IBUs were 71 (Tinseth). In actuality, the IBUs were no where near 71, but it was still a very tasty beer. It even scored a 36 at the NHC, that year. It may have scored a bit higher if it was entered as a Pale Ale instead of an IPA.