This was the final case design in the 30 Light Rifle with the neck lengthened to 1.56” (51mm), together with some minor cosmetic changes. Olin Industries was granted permission by the Office of the Chief of Ordnance to use this case design in April 1952 and this became the 308 Winchester case.

The ball loading was designated T65E3 in 1949.

  

  

A quantity of T65E3 was packed out at Frankford Arsenal during 1951-52 in 20 round boxes stamped T65 (see HWS3. p.164). The only other marking are what appear to be an order/project number as well as the Lot#. Lot1 was headstamped FA ● 50 ●. It is unknown why these were packed as T65 or why this was a special lot. The dots are thought to indicate a special primer pocket for the P4 primer, but this is unconfirmed.

  

The specimen below was loaded during September 1952 at Frankford Arsenal as a small experimental lot of 600 rounds (LOT FA x30-1792) with solid brass bullet. These were for special ballistic tests at Aberdeen Proving Ground.

  

Remington delivered cases to Frankford Arsenal for loading and testing in February 1950 made from an aluminium alloy. These cases were treated with a graphite coating which gave a blackened finish, apparently to facilitate easier extraction.

    

    

         

Initial production of the AP load was designated T93E1 with the FAT6 bullet and was also loaded under Lot FA X30-1471 in aluminium alloy cases supplied by Remington.

  

  

The designation for the API loading was T101E1

  

The observation cartridge was designated T103E1 and the development was contracted to Winchester with cases supplied by Frankford Arsenal. The specimen below with brass primer and green sealant was in all probability loaded at Frankford Arsenal using Winchester bullets.

  

The tracer was designated T102E2

  

           

This dummy cartridge was loaded in early 1953 and given the designation T70E5 with corrugated case.

  

The T70E4 dates from 19 May 1950 and had a mouth crimp and heavy neck cannelure securing the bullet.

  

Cadmium plated case

  

The first specimen below is part of Lot FA X30-2180 that did not have any neck cannelure. The bottom specimen was loaded with an inert filler to simulate the weight of a loaded cartridge.

  

The grenade launching cartridge was designated T116E1

                       

During this period in the early 1950’s the Marine Corps had an interest in grenade launching cartridges and one lot was loaded for Marine Corps testing at the Quantico Development and Test Center. For greater range the case was extended for an increased propellant charge.

  

The High Pressure Test round was designated T71E1. It was loaded to pressures of about 65,000psi and the cases were stannic stained with the Cal. 30 M1 HPT bullet.