I want to get into precision rifle shooting...would like to reach out to 600yds with confidence. I have never really done much long rifle shooting. I've had a remington 700 VTR in .308 but it wasn't nearly as accurate as I had hoped. Not to mention is short bolt I want to go long bolt caliber... Whats a good rifle/caliber to help me accomplish my goal and be under 1500-2k?