duotone

Just getting into guns, and bought a Remington 597 for my son and I to have some fun with... Now, I'm obsessed with this! I have 2 things I'd like to explore: 1: What can I do / what would you suggest I do with the 597 to make it more accurate to 100yards? 2: I'm shopping for another rifle, and most likely it will be a bolt action so I can run sub sonic rounds through it (CCI CB's won't cycle in the 597). I'm looking at the Savage Mark II TR. 3: Are there any sub sonic's that will cycle in a semi auto (597 or 10/22)? Thanks