Russian Mosin Nagants (7.62x54R) have nice site ramps marked 200 (meters), 300, 400, 500, 600, 700 and possibly up to 1000. They work fantastically. Iron sights. A 500 yard shot is simple with it. Albeit the target is likely smaller than the front site at the long distances but you can get real close no matter what. I have hit larger sized targets at 500 and 700 easily. A good alternative to the scope option. Plus the 7.62x54R round is a big boy round similar to the .308 and .30-06.