It's Indian production 7.62x51 produced in 1975, with a 146 grain FMJ bullet designed to travel at 2,750 fps, and produce approximately 50,000 psi chamber pressure. However, some older Indian production ammunition was sealed with tar, and may pose a hazard, or at the very least be dirty to shoot.
M80 fireworks are illegal in California.
M80 - 2004 Jim McNeil - 2.11 was released on: USA: November 2005
M80 - 2004 France 5-5 was released on: USA: February 2009
M80 - 2004 Larry Linkogle - 4.3 was released on: USA: 14 October 2007
M80 - 2004 SRH 3-1 was released on: USA: 1 April 2007
M80 - 2004 Seth Enslow 2-9 was released on: USA: November 2005
M80 - 2004 Colin Morrison 1-10 was released on: USA: November 2004
M80 - 2004 Jeremy McGrath 5-3 was released on: USA: January 2009
M80 - 2004 Dan Pastrana 2-3 was released on: USA: October 2005
M80 - 2004 Brian Deegan 1-6 was released on: USA: November 2004
M80 - 2004 Nate Adams 1-3 was released on: USA: October 2004
M80 - 2004 Adam Jones 1-7 was released on: USA: November 2004