Um, have you ever looked at a map of that area? definitely scary if you are speaking authoritatively and haven't. It's about 4k just back to the head of the canyon where Tuttle Creek begins...and much of the terrain back to the car (7k feet total from summit) is low angle shredtastic (if on snowboard) and nice corn cruisin' on skis. RE: the angle, take a look at the couloir on a map, then take a look at something that is legitimately that steep. There are a few couloirs of this variety in the Eastern Sierra you can choose from, be creative. As granjero states from experience from descending that couloir, the angle only slightly at the top depending on snow. 35-40 degrees.
If doing a Shasta descent, opt for the classic, Hotlum-Wintun ridge for 7k of glorious corn riding back to the car, thus allowing you to go light.