My xtps do the same depending on distance and shot placement.
Are you just now cutting up?
Yep. Three 22 pound bags of ice unopened and holes poked in the bags, covered with a towel. Then deer quarters on top. Don't open it and pull the drain plug once in the morning and night. Keeps the meat about 33-35 and let's it age. Way better method than letting them hang where air dries them.
You wrap em in wax paper or saran wrap?
How does the aging work out for you?
I had read that since wild game doesn't have the internal marbling of beef that adding doesn't do as much for it.
I haven't had any large problems with gameyness in my deer meat in quite a few years. I also have not shot any super old bucks recently either. I may try it if the weather is appropriate or if I get a cooler like yours at Christmas.
Oh... as for the original question. i shoot powerbelts myself, but have yet to put one in a deer. i am anxious to find out what they do on impact.
I have hunted almost exclusively with MZ's for the last 20 years and I can only tell you that Powerbelts would not be my first choice, or my second, or my third, or my forth, or my..........ever
Just my choice, everyone gets to make their own choices for their own reasons. A lot of deer are killed with them