I must say the loudest rifle, I have ever heard has to be a braked 338-378WBY. This is a monster cartridge. I shoot and reload for 300WBY and 340WBY, which most people consider grossly overpowered, they hold over 90gr of some powders, the 378's will hold 120gr plus. I thought at one time that I would like one, but nah, enough is enough!