So, I've got a good gun, and found a good ammo. But I can watch the reticle move contra the target with each heartbeat. Short of completely stopping my heartbeat.... ..... how can I mitigate this? I use a front bipod and a rear sandbag. I've wanted to use the (Atlas) bipod to mimick PRS style competition, but.... am I hurting my self ? Rear bag: Tricks, tips, magic incantations and talisman welcome.