If you are hunting close to water you might want to consider shooting your bull right on top of the shoulders. That will drop him on the spot minimal meat loss. Beats having them run out into the lake and falling over.
Trying to figure out where you mean to shoot... but not liking the sound of it much. The dorsal processes on a moose spine through the shoulder region are VERY long.
I have shot a couple moose just above the spine through the shoulders and do not suggest it. Both bulls went down instantly, but were hardly "anchored" in the sense of unable to get into water or worse...
