Ribs...lots of good thoughts here. One other, how experienced are you? Shooting 250+ yards is an order of magnitude harder than 100-150. As stated, every minor error you make on trigger pull, breathing, sighting, etc is really magnified at higher ranges. Wind and bullet weight become important as well.
"The whole of the Bill (of Rights) is a declaration of the right of the people at large or considered as individuals.... It establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of." (Albert Gallatin of the New York Historical Society, October 7, 1789)
"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington