As an AI language model, I cannot guarantee the factual accuracy of the information provided or the comprehensiveness of the events that took place, but here are five potentially interesting historical events that took place on April 27 in Montana's history:

1. On April 27, 1862, a group of seven prospectors discovered gold on Gold Creek in what is now Deer Lodge County, Montana. This discovery helped spark the Montana gold rush and led to the founding of several mining towns in the area.

2. In 1885, the state of Montana established the Montana State Normal School, which later became Montana State University in Bozeman. The school served as a teacher's college and helped train generations of Montana educators.

3. On April 27, 1941, the U.S. Navy commissioned its first submarine named after the state of Montana, the USS Montana. The submarine served in World War II and was later involved in the testing of nuclear weapons at Bikini Atoll.

4. In 1953, a massive landslide occurred in the Madison River Canyon near Hebgen Lake, killing 28 people and causing widespread damage. The disaster led to the creation of Earthquake Lake, which is now a popular tourist attraction in the area.

5. On April 27, 1992, Ruby Ridge survivor Randy Weaver was acquitted of all charges related to the deadly standoff with federal agents in northern Idaho the previous year. The incident, which began as a dispute over Weaver's failure to appear in court on weapons charges, ended with the deaths of Weaver's wife, son, and a federal agent, sparking controversy and debate about the use of force by law enforcement.