were likely intended for sale in South America, where use of the 7×57mm cartridge was widespread. All known 7×57mm Karabiner 88s were produced by Haenel. Variants At the time of adoption, the M/88 "Patrone 7.9 mm" was loaded with a 14.6 g (226 gr) round nose bullet that measured 8.08 mm (.318 in) in diameter. In 1894/95 the German Army changed the barrel specifications from 7.9/8.1 mm to 7.9/8.2 mm hoping to improve accuracy and Gewehr 88 rifles made from that date on had different bores. The 8.08 mm (.318 in) bullet diameter however remained unchanged. After 1895 most Gewehr 1888 rifles were regrooved. In 1903, the Germany Army adopted a new service cartridge that fired lighter bullets measuring 8.20 mm (.323 in) in diameter. From then on, many Gewehr 88 rifles were rechambered to fire the new 1903 pattern 7.92×57mm Mauser cartridge becoming Gewehr 88 S rifles. This rechambering required more work as the 7.92×57mm Mauser chambering required a wider chamber throat to take the thicker brass of the new 1903 pattern cartridge. 7.92×57mm Mauser adapted rifles have the receiver marked with a large "S" rollmark. From 1905 the rifles were also converted to use the Gewehr 98 type stripper clip by adding stripper clip guides to the top rear of the receiver and altering the magazine becoming Gewehr 88/05 rifles. After the start of World War 1, some of the remaining Gewehr 88 S rifles were modified to the Gewehr 88/14 standard, which was generally similar to Gewehr 88/05 but with cruder workmanship. Some 88's were sold to various nations or armed groups, or captured in combat and therefore a wide variety of markings can be found such as Bulgarian stars, English proofs, Turkish crescents and symbols, Polish eagles etc. Gew 88's were re-serialized by the army capturing them in some rare cases (i.e.; Greece/Turks) or/and when they were re-barrelled. The markings found on Gew 88's are very extensive and therefore are a topic of their own. Modern ammunition use The maximum operating pressure for the Gewehr 88 commission rifle is less than that of any 8 mm Mauser rifle, as the makers of the Gewehr 88 did not fully understand the greater energy of smokeless powder compared to black powder. Shooters planning to use modern 8 mm ammunition in a Gewehr 88 slug their bore and chamber as there are four different possible bores and grooves and