Im looking at buying my first rifle. I plan on doing target shooting at long range, up to 500 yards. Ive narrowed down my choices of rifles to the marlin x7 series or the stevens 200. Im definitely leaning towards the marlin but ive read on many sites that it is discontinued. However, the main question is which caliber should i get? Im thinking 25-06, 243, or 308, but im still open to sugestions. Also Im on a tight budget also so im worried about the cost of 308 rounds. Thanks for your help.