Despite only having a 100y range nearby, I've an interest in long range shooting. So I occasionally wander around sniper sites. Do current military snipers teams use a heavy barreled rifles for shot consistency, or light barrels because they have to hump it to god knows where? I guess I'm thinking about .308s mostly. I can't imagine there's any such thing as a 'light' .50. Also thinking about .50s; at what point does a rifle becomes a cannon?