Per Wiki...
“Unlike bologna and salami, which are sausages, pimento loaf is baked like a meatloaf in a loaf pan.[5][6] Inexpensive pimento loaf is made with chicken and other ingredients common to inexpensive bologna. Also, less expensive pimento loaves are baked in sleeves instead of pans to give the cold cuts a round appearance, leading to the misconception that pimento loaf is related to bologna. Since pickles are typically less expensive than olives, pimento loaf is far more common as an inexpensive deli meat.”