The 338-06 is an A-Square (Art Alpin) chambering, standardized under SAAMI about 1998. Speer discovered unusually good ballistics when it developed loading data for this former wildcat chambering. Despite having long-ago been dropped as a factory chambering by commercial gun-makers, it is a fine choice for those interested in a custom rifle bridging the gap between the 30-06 and the 35 Whelen. With the best bullets, this round is entirely capable for hunting any species worldwide. It has a usefully flatter trajectory than the 35 Whelen and a far better selection of bullets. Compared to the 30-06, it can deliver heavier bullets with more energy and similar trajectory. The 338-06 might be an ideal choice for recoil-sensitive hunters intent on taking large, dangerous species. While less than ideal for use against the biggest and most dangerous of game, it will certainly do the job when loaded with a heavily constructed bullet delivered with a well-place shot. Heritage of this case dates to the 1870s with the introduction of the 40-70 Ballard case.