I have quite a bit of Hack, Hack-ma-tack, Tamarack, or Larch on my property. It is was mostly used for Mud sills for building that meaning the sill sits directly on the ground. Also another use was and is for "Ship Knees" , they dig up the stump and saw it on a mill. They use the Knees to form the bottom- front, bow/floor of ships. About 10 years ago a man close to me called and asked if he could come and potentially dig up some stumps for this purpose. He did this solely for a living and a good one at that. About 3 days later he was killed while doing this at his farm I am not sure of the details though.
I use it for sills for my barn and shed and a carrying timber for our addition . That one was 8x8 x 24' most of mine are about 20"+ on the stump and 70' tall give or take and it is some heavy stuff. I cut about 10 cords for pulp years ago and the 4' butt cuts took two of us to lift them 3 feet onto my woods trailer, I would guess those were 20" - 24" on the stump and weighed over 300# each.