Winchester Primers Small Pistol Match For Sale. Non-corrosive, all-weather primers provide rapid and reliable ignition in any shooting environment. Winchester ensures that all primers are dependable, quick, and accurate. In the Winchester testing facilities, primers are routinely and carefully examined for consistency and sensitivity at temperatures and under circumstances that are much beyond the ordinary. Winchester ensures improved sensitivity for more positive firing in all firearms, carefully regulated weights of primer combinations, uniformity in size and quality, exact measurements and tolerances for anvil heights, and stability in high temperatures and humidity.