I am new to long range shooting and I am looking for a rifle to handle 500 - 1000 yard shots. I am interested in the Remington 700 CDL 7mm ultra mag, but open to suggestions for the best caliber and rifle. I know that this will need some work to achieve the accuracy that I am looking for. I am looking to know what parts may need to be upgraded;ie. barrel, trigger, etc. as well as what scope and mounts to use. If there are any gunsmithing issues that need to be addressed, please let me know. I have heard of so many things (bedding the stock/barrel?, muzzle brakes, etc.) and don't know what I will need. How long should I expect a rifle to last and what may wear out? Any help for a rookie would be greatly appreciated.