I don't have much of a problem drawing my Matthews verticle bow back, 65lbs, because I practice with a slight bow in my left elbow even in hot weather so when I'm all bundled up I can still draw. The proof in the pudding is I did get a deer 10 yds in front of me and 25' below me, that was a steep angle.Well besides the comfort of a warm blind during those temps in December, you'd never get a vertical bow drawn with all that warm clothing on. I hunt in some of those cold temps in a tree stand and must limit my clothing in order to draw my bow. It's not that staying warm isn't possible while bowhunting in a tree stand. It's being able to shoot the bow when needed. This is where the crossbow shines also. For you guys that want to bulk up to stay warm but can't effectively draw a bow in sub zero temps while bound in clothing, the crossbow won't let you down.
I was trying to put the arrow on the left side of the spine but I shot through the upper vertebrae, into the rib high right, and exited a few inches below that, the deer ran about 50 yds and collapsed. I'm old-fashioned because I still use the Bear Broadheads of yesteryear because I've used Rage & G5 and both failed me. The Rage hit the deer broadside at 25 yds what looked like it was going to be a good heart shot, the arrow bows (I have video of it with lighted nocks and you can see it bow really good) from hitting the deer and then shoots underneath it. Two days later after switching to G5's I shot a turkey at 20 yds and it did not exit. I have shot deer with the Bear Broadheads and they have exited every time and it never has slowed down going through a turkey. Yes, I like the practice broadhead of the mechanical, which I use to practice with but before the season I switch back to the Bear Broadheads to zero in and hunt with them. All this with the same clothes on I described.