Just purchased a Stealth in 6.5 CM and now I need a scope for it. I値l mainly be shooting at 200, however if a buddy of mine come through (very good chance) I値l be able to stretch that out to 600+/-. I have the model narrowed down to either an Athlon Argos 6-24x50 or 8-34x56. With the above mentioned which would serve me better, also what size rings should I use? Thanks for the help.