Em caso de dúvida: .50

Poder de fogo

Just in case your current gun isn't big enough...

E para saber mais:

http://en.wikipedia.org/wiki/.50_BMG

http://www.fcsa.org/

http://www.fcsa.co.uk/index.htm

http://www.biggerhammer.net/

http://www.cobb50.com/

http://www.barrettrifles.com/