Use only powders with good ignition characteristics. Warning: - Since fast burning powders are used, it results in very low loading densities Therefore the possibility of double charging is very high!! - Please take extra precautions to prevent this from occurring. Subsonic loads using standard components will not cycle high power, semi auto rifles. Therefore, it is actually a waste /moot point shooting with these designs at subsonic velocities. Projectiles with sharp pointed ogive’s do not make good subsonic projectiles becauseĮxternal and Terminal ballistics at subsonic velocities does not exploit the design features of high BC jacketed SP or HP-BT bullets. This leads to low loading densities, which might cause ignition problems.īecause the requirement is to have subsonic velocities while maintaining the best possible combustion efficiency, the velocity should be kept as close as possible to the sonic threshold for the specific conditions, preferably between 1025 Fps to 1100 Fps. Therefore faster more efficient burning powders are required. This means the combustion efficiency is not good. The practice of down loading rifle calibers to subsonic velocity levels must be approached in a special way.Īt subsonic velocities the chamber pressure is extremely low in most rifle calibers.
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