Winchester NATO-Spec Military Primers available at SUPREME GUNSHOP ( Winchester WSR Primers ) are the same primers that are used in the Lake City 556mm ammo, and they are manufactured by Winchester. Winchester WSR Primers are manufactured to strict standards to ensure consistent performance from shot to shot.

Winchester Small Rifle 556mm

To ensure consistency and sensitivity, all primers are regularly and extensively tested at temperatures and under circumstances that are considerably beyond those seen in everyday use. When it comes to primer combination weights, Winchester ensures uniformity in size and quality, exact measurements and tolerances for anvil heights, and stability in the face of fluctuations in temperature and relative humidity even for the Winchester WSR Primers.

Winchester Small Rifle 556mm

To ensure consistency and sensitivity, all primers are regularly and extensively tested at temperatures and under circumstances that are considerably beyond those seen in everyday use. When it comes to primer combination weights, Winchester ensures uniformity in size and quality, exact measurements and tolerances for anvil heights, and stability in the face of fluctuations in temperature and relative humidity even for the Winchester WSR Primers.