Is this a one off with this particular hog batch or more a general issue? In reading your post you indicated "at times". I was wondering if something like this is happening in your grinding
http://www.alliedkenco.com/mushymeat.aspx
Also, regarding stuffing bulk bags. I developed a cheap and simple solution my son and I have been using for years. Also works pretty fast and easy. Often better than getting out the crank stuffer and having the pain of cleaning it. I made several of the outer tubes so they could be loaded like magazines and then production stuffed. Stand the tube vertical in the meat lug. Pack with meat to about 1 inch below the top. Tamp gently with plunger to pack. Insert bag onto outer tube hold with hand and insert plunger and push. Can be done by one person by standing it vertical with end of plunger on counter and outer tube and bag at the top but two people is way easier and quicker. After a few times you know exactly how much to put in the tube. I do not glue the cap onto the plunger tube. Makes it all easier to wash up.
Outer Tube: 2 inch Schedule 40 PVC 15 inches long
(this is good length for fully stuffing 1 lb bags)
Plunger Tube: 1.5 in thin wall PVC 16.5 inches long
Plunger Cap: Cap for 1.5 inch pipe
Looks like this:
View attachment 343358 View attachment 343359 View attachment 343360
Hum... after reading that article, now I need to check my grinder out. This grinder is at least 20 years old... probably older, so I'm sure there's worn parts.
Also, I do like your idea with the pvc. I've got something similar for filling 8" vacuum seal bags, so I can keep the sides from getting wet while filling. I believe it's a piece of 4" that I stick down in the bag, fill with meat, then slide the pipe out allowing the meat to fall out of the bottom.
As far as one certain hog. No sir, I think last year we butcherd four or five one time then two or three another so it wouldn't have been the meat from a certain hog, because it seems like just about every bag I've cooked has been this way.
Part of me thinks I might have had too much fat in the mixture, I know this is something none of you can help trouble shoot since your not here to visually inspect it.
Here is my thought process behind that theory.. tell me what y'all think please.
When I grind deer burger I normally do a 70/30 mixture. 70% deer to 30% store bought bacon ends.by doing this the meat is always firm
On deer pan sausage it's normally a 60/40 mix, again the outcome had always been firm.
I think this is due to deer meat being so lean, and bacon ends being 50/50 on fat to meat give or take.
Although, they were what we call "woods" hogs last year, they were extremely healthy and fat. I didn't discard any of the fat, all of it got ground up with the meat.
Most of the hogs weighed between 180-220lbs on the hoof, with a good thick layer of fat across the back