 The .333 Jeffery Flanged never enjoyed the popularity of its rimless counterpart, this has been attributed to Jeffery's initial reluctance to regulate double rifles in this round for the 300 grain loading.The .333 Jeffery was somewhat overshadowed by the arrival of the .375 Holland & Holland in 1912.As with many British proprietary cartridges, the .333 Jeffery was forced into obsolescence when Kynoch suspended ammunition manufacturing in the 1960s, Kynamco resumed manufacture of the Kynoch range of cartridges in the 1990s meaning the ammunition is again commercially available, although no firearms manufacturers make factory rifles in .333 Jeffery today.