This was kinda what I was figuring. Thank you.
I never realized the .050" numbers published for MP cams were calculated and not actuals. This is all making so much sense now. I remember having a similar question when I had the 268/272,.450/.455 cam as well. That one came up about 8-10* short of the calculated .050" numbers for duration if I remember correctly.
Thanks again, I'll write P4452992 on the box along with the actual measurements.