From the start of the modern biathlon in 1958 until 1965, international competitions were held exclusively using high power centerfire cartridges (such as the .30-06 and 7.62 NATO). Fullbore biathlon was part of the Winter Olympic Games in 1960, 1964, 1968, 1972 and 1976. Fullbore World Championships were held from Saalfelden 1958 to Vingrom 1977, with Lake Placid 1973 being the first time the World Championships took place outside Europe. Caliber discussions was a recurring subject, and there was a long trend of different nations moving towards various 6.5 mm or smaller calibers. In 1976 it was decided by the International Modern Pentathlon Union (UIPM) that all international championships starting from 1 January 1978 would be conducted using the .22 Long Rifle (LR) smallbore caliber. The last major championship using fullbore rifles was the 1977 World Championship in Vingrom, Norway. From 1978, .22 LR smallbore was the official caliber in international biathlon. High power centerfire cartridges are, however, still used today in Nordic field biathlon and moose biathlon competitions.