In the interest of helping us all be better at determining 50" moose, I've created a Powerpoint slideshow with every possible moose picture on this forum that list the width of the moose rack. If you are successful and care to participate, please send me pictures of your moose, ideally with the head still attached. Moose in the 45-55" range are especially important. Email me pictures at firstname.lastname@example.org and I will update it regularly. Thanks.
The aforementioned Powerpoint can be downloaded below.