This grim-looking fellow--normally he smiles a lot--was my guide. His name is David Blayney, and if he looks military it's because he was a professional soldier for a number of years. David's rifle started life as a Tikka, and was converted to a cartridge called the .338 Murmur (or as it's known in some parts, the .338 BR). This is a 7mm Remington BR case necked up to .338 and loaded with 300-grain bullets loaded to about 1,000 fps. The speed of sound is 1,125 fps, so if the slugs are traveling at less than that, you avoid not only the muzzle blast, but the supersonic crack of a bullet breaking the sound barrier.