According to COTW, " Introduced by Jeffrey in 1919 and subsequently adopted by the British Match Rifle Committee.... only listed by Kynoch untl 1930... case is the same as the experimental 276 military round, capacity the same as the 30-06. Ballistics: 174FMJ @ 2850, 3050 ft.-lbs."

CH4D (www.ch4d.com) lists dies for about $75.00.

Stuart