JB,
Well done! You have company, I got my first ML deer this year too.
Mine was also a doe taken at about 80-90 yards-spine shot and had to finish with a neck shot.
I hunt in Illinois where only shotgun or ML are legal.
What was so good was that had I had a shotgun, I would not have been able to pull this shot off!
She was quartered away and I had to shoot between two cottonwood trees.
I was very amazed and pleased.
My load was a 240gr T/C cheapsot with 100 gr clearshot powder.
Congrats!