I used to use a hand grinder and some small food processors.They worked Ok.I was grinding up some rattlesnakes with the hand grinder and the largest of those just wouldn't go.That spine was just too much.I immediately ordered a 1HP electic grinder and it is amazing.It is a little much for some budgets,even mine but it was time.It grinds up anything in it's path.I use the smaller 1 and 3 cup choppers to do glands because I rarely have huge quantities of any glands.
The big grinder will reduce a snake into a fine,sticky paste in minutes-no arm strain.It will reduce bone in, muskrat pieces,including skulls,into a fine paste,very quickly.I leave all the bones in.Of course we all have to go by our own budgets but I have no regrets getting the 1HP grinder.Regardless, it is all fun stuff.
I just burned up two second hand store blenders yesterday grinding beaver oil sacks. I think it's time to buy a electric meat grinder. I'm also in the dog house because of the dogs rolling in the sac oil left on the ground. I'm not sure how to totally eliminate that problem.
Right now I’m having amnesia and déjà vu at the same time. I think I’ve forgotten this before.
What size motor are you using Danny? I have almost identical set up as you. I have half horse power motor on mine off a old air compressor. Think may have about $80 total in mine and been using it for 12-13 years.
I use cableas grinder's for bait meat and glands. Torerxe grinder's are good also, it's our wild game grinder. Grinds 80-100 lbs. Trim and beef fat mix times 2 every year. Plus 10- 20 lbs. Of sausage / have gone to chopped and formed jerky from our antelope also.