Question: An anvil firing and explosive fireball have been used to begin which long range precision rifle event held near Orofino, Idaho?

Context paragraphs:
Miami Maniac: The Miami Maniac, often shortened to The Maniac, is the official mascot of the University of Miami Baseball program.  Although Sebastian the Ibis is the official mascot of most University of Miami sports, the Maniac is the only mascot which performs at Hurricane baseball games.  Created in 1982 by visionary College Baseball Hall of Fame head coach Ron Fraser in 1982 and originally performed by John Routh, the Miami Maniac has been a constant at Mark Light Field ever since.  Some believe that the mascot idea was modeled after the original Orofino High School Maniacs, from the small town of Orofino, Idaho.  The Maniac mascot was used there many decades prior, and has been the target of much scrutiny due to the high school's proximity adjacent to an Idaho State mental hospital.  More recently, the mascot received national attention after Idaho State officials proposed adding the Maniac mascot to an Idaho vehicle license plate.

Precision Rifle Series: The Precision Rifle Series (PRS) is a precision rifle based shooting sport derived from practical shooting.  The series have a championship style where competitors collect points from matches nationwide, and thereby is ranked across the nation.  Top ranked competitors get to compete in the last match of the season which is the "Precision Rifle Finale".

WXK98: WXK98 is a NOAA Weather Radio station that serves the Southern Idaho Panhandle and the Washington Palouse.  It is programmed from the National Weather Service forecast office in Spokane, Washington with its transmitter located near Lewiston.  It has two repeaters, KXI82 which broadcasts from Grangeville on a frequency of 162.450 MHz and WZ2535 which broadcasts from Norton Knob near Orofino on a frequency of 162.500 MHz.

Anvil firing: Anvil firing (also known in the USA as an "anvil launching" or an "anvil shooting") in the USA is the practice of firing an anvil into the air with gunpowder.  In the UK this is where black powder is filled onto the top of the Anvil and ignited.  If the Anvil did not shatter it was deemed safe to use.

Alethea Sedgman: Alethea Sedgman (born 24 January 1994) is an Australian sport shooter.  At the 2010 Commonwealth Games, she won a gold medal in the women's 50 metres rifle three position event.  She was selected to represent Australia at the 2012 Summer Olympics in the 10 metres air rifle event and the 50m rifle event.

ISSF 300 meter standard rifle: 300 metre standard rifle is one of the ISSF shooting events.  It is similar to 300 metre rifle but there are more restrictions on the rifle (quite similar to those in 10 metre air rifle).  The course of fire is a three positions program of 3x20 shots.  This event is based in competitions with army-style rifles, and as such dates back at least to the 19th century, although the early championships had a true army rifle event, using the model of the host country's choice.  The standard rifle event as such was created in 1947.

Dworshak National Fish Hatchery: Dworshak National Fish Hatchery is a mitigation hatchery located on the Clearwater River within the Nez Perce Reservation near Orofino, in north-central Idaho.  It was constructed in 1969 by the Army Corps of Engineers, and is co-managed by the U.S. Fish and Wildlife Service and the Nez Perce Tribe.  The hatchery is one of the largest combination producers of anadromous (migratory) fish in the world.  These fish make a 1000 mile round trip to the ocean and back to spawn in the Clearwater River.  The Dworshak Dam blocks access to the historical spawning areas on the North Fork-Clearwater River for the steelhead, and it is too high for a fish ladder.

TPG-1: The Unique Alpine TPG-1 [where "TPG" stands for German: "Taktisches Präzisionsgewehr" ("Tactical Precision Rifle")] is a modular, multi-caliber, tactical applications precision sniper rifle made in Bavaria / Federal Republic of Germany.  This rifle is part of the equipment of the Hungarian police.

Boomershoot: The Boomershoot is a long range precision rifle event held near Orofino, Idaho, each year in late spring.  The targets are filled with explosives at ranges from 375 to .  Shooters are allowed to engage as many targets as they are able during the all-day event.  Nearly every year the amount of explosives has increased; in 2004, the amount of explosives put out for people to shoot was greater than all of the other years combined.  In 2005, new targets were introduced with smaller amounts of explosives to reduce window breakage in the surrounding countryside.  In recent years, the event has also featured an explosive fireball and an Anvil firing to start the event and entertain the participants.

Abhinav Bindra: Abhinav Bindra (born 28 September 1982, in Dehradun,Uttarakhand,India) is an Indian businessman and retired professional shooter who is a World and Olympic champion in the 10 m Air Rifle event.  By winning the gold in the 10 m Air Rifle event at the 2008 Beijing Olympic Games, he became the first Indian to win an individual gold medal at the Olympic Games.  It was also India's first gold medal since 1980, when the Men's Field Hockey Team won the gold.  He is the first and only Indian to have held both the World and Olympic titles at the same time, a feat he accomplished by capturing the Gold Medal at the 2008 Olympic Games in Beijing, after having won the gold at the 2006 ISSF World Shooting Championships.  Abhinav won Gold Medal in 2014 Commonwealth Games at Glasgow.

Supporting paragraphs: Boomershoot Anvil firing
Answer: The Boomershoot