Howdy. I'm interested in getting into long range shooting, but want to start with what I have. I already have a Remington 700 .270 win, a Winchester 70 .243, and a Remington 742 .30-06. If I were to choose one to practice with and make improvements on, which should I start with? The .243 seems to have the friendliest ballistics based on the research I did on the ammo I already own. Does anyone have a suggestion? Thanks.