Originally Posted by Demosthenes9
A Butt is 1/2 of the shoulder. The other half is the "Picnic ham/shoulder". If you pick up a "whole shoulder", it's the butt and the picnic together. As each hog has 2 shoulders, it will yield 2 butts and 2 picnics.
...Below from another source...JJ
What is the difference between a Pork Butt* and a Pork Picnic?
The 'whole' pork shoulder (15-20 lbs) consists of the upper part (Boston Butt) and the lower part of the shoulder (the Picnic). You can purchase it whole, however most times it is found in the store separated into the two pieces mentioned above. The difference between Picnics and Boston Butts are the bone structure......the butt has a small shoulder blade bone and the picnic has the front leg bone and joint.
The picnic is normally sold with "skin on", whereas the Butt only has a small fat cap. Both have excellent BBQ meat, but the Boston Butt is the better value. The meat from the Picnic seems "sweeter".
* a/k/a Pork Shoulder Blade Roast
View before the Butt is skinned...