@twilliams Most untrimmed butts are going to be closer to 75/25. Or the ones I checked one day all were, next time I am at sams or local supermarket I will check again. I just did it by finding out how mans grams of fat each serving had and then converting the total weight in a serving to grams.

@Abu65 i dont know what kinda grinder you got but like i say if its a smaller one and you got bigger chunks then i see no issue running it through the kidney plate. It will certainly help the meat to run smoother through the 3/16th. Are you going to run it twice through the 3/16th? I personally would recommend that.