Remove the heads from the shrimp immediately after catching or purchasing. Chill the shrimp until ready to can.
Thoroughly wash and drain the shrimp to remove any impurities.
Prepare the brine with ¼ to 1 cup of salt and 1 cup of vinegar per gallon of water. Boil the shrimp in an acidic brine for 8-10 minutes.
After cooking, rinse the shrimp in cold water and drain well.
Peel the cooked shrimp and pack them into jars with about 1 inch of headspace.
Cover the shrimp with additional boiling salt brine, using 1 to 3 tablespoons of salt per gallon of water.
Add hot water to the pressure canner per the manufacturer's instructions.
Place the hot jars in the canner, lock the lid, and bring to a boil.
Vent the canner for 10 minutes, then close the vent and reach 11 PSI for a dial gauge or 10 PSI for a weighted gauge, adjusting for altitude.
Process both pints and half-pints for 45 minutes at the specified pressure (see table below).
Allow the canner to depressurize naturally after processing.
Carefully remove the jars and let them cool on a cutting board for at least 8 hours.
Check seals, label jars, and store in a cool, dark place.