Step 3: Chop meat
The ground meat will chop and grind easier if it is partly frozen beforehand. Chop it into pieces small enough to fit into the meat grinder.
You can use whole meat if you prefer. You are grinding it, after all.
For that matter, nothing says you have to use beef. If this process works well, I will repeat it with venison, pork, beef, and mixtures thereof. Even organ meats are not off-limits. Next year, I will also use deer and elk hearts, if my hunts are successful.