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105 x 770 Experimental case

That is a huge wealth of information. I especially like the details of the bore evacuator in the drawings. I had always wondered how that was done.
 
Found a blurb on the 105-mm T4 AA T12 HE round.

Cancellation of T12 HE

38 lb boat tailed H.E. round for the 105mm gun T4, MV 3000 ft/sec
350 complete rounds were assembled and used in range firing in the 105mm AA gun T4. The assembly of the T27 primer in the M6 cartridge case used with this ammunition gave trouble, by loosening off during transit/ This fault was subsequently cured, and loading and assembly of some 2500 rounds proceeded.

The project has been terminated in interests of projects of greater importance (OCM 27096)
 
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