I shoot long range with my iron sighted revolvers and with wounded game, eat to survive, or "bad" guys. 500 yards is not a safe place to be.
Watch my 5 part video series on youtube, its on long range revolver shooting with iron sights. (
http://www.youtube.com/user/texasfivegun )
Take some liquid paper, a needle, a brass "tooth brush" and a beach chair
if you can find one.
Use the liquid paper on your front sight. Make a line with the needle to use as a reference and brush of the
dried paper with the brass brush to start over if your marks are wrong or when your finished.
The chair I am talking about puts your butt about 4" off the ground and lets you lean back. You pull your legs up
put your hands/wrists between your knees. It works better "much better" for me than a bench rest or any thing else.
I have a Caldwell HAMMR machine rest and I can out shoot it with my chairs.
You must have "0" flinch for this, a good spotter helps and if you can get the sun behind you the bullets are easy to see in flight.
You may run out of front sight with a long barrel, short to medium barrels and tall front sights are easier to work with.
I have never shot a 500 or 460 S&W but we have found with 500 & 475 Linebaughs, 414 & 445 Supermags, 454 Casull, and
44 Remington Magnum. A heavy for caliber cast lead bullet works best. A gas check is easier to see in flight. A high velocity
is not needed. About 1200 FPS is what we use the most.
A 45ACP or 10MM Norma works great to 200 yards and good to 300 yards.
If I can help PM me and I will give you my phone # and email.
Good Shootin and Good Luck! Chad