In November 1952 the US Army Operations Research Office at Johns Hopkins University initiated the SALVO program. It was a study on US infantry weapons and their effectiveness in combat. Studies were done at Ballistics Research Labs (BRL) as well as Aberdeen Proving Grounds (APG). These studies were done to improve hit probability and wounding power and much of this research consisted of high velocity reduced caliber rounds and multiple bullets under controlled conditions.

Olin Corporation was contracted in July 1952 for the development of a .22 cal experimental cartridge using a necked down Cal. 30 Light Rifle case. This simplex cartridge was called the Cal. 22/T65.

   Dummy round with case hole as described on p. 296 HWS3.

   Ordinary GM steel core bullet

First specimen is loaded with the 68gr. Sierra bullet with lead core and the second specimen is the lighter 55gr. load. It is unknown for which test programs these were used. The box labels simply stated “.22 LEAD CORE HOMOLOGOUS”. HWS3 p. 296

This specimen was loaded with an electric primer. The primer was a scaled down version of the 20mm M52A3 primer developed by Olin for these tests. These rounds were loaded to control the interval between individual shots.