last weekend, i just hit my first 2000 yard target.
(see link in 1000 yards & beyond thread)
my target is 1m high (39") x 1/2 m wide made by LV steel targets.
i sent him my sketch and he plasma cut it in ar500 steel.
i rounded the edges to prevent any sharp objects hitting my foot or head by some sort of pick-up-n'-carry boo-boo and i also had him round the inside corners to prevent any stress joints. besides, the curved corners look kewl. he can cut any shape you send to him.
imo, anything much larger than this just becomes too heavy to manage (mine weighs 80 pounds or so)
at 2000 yards, i't's still quite easy to hone in on at 25x
i made the target 1m tall to make it compatible with the FFP mil system in my scope and at 1000 yards, it is exactly 1 mil-hash mark tall.
anyway, at this distance, your image can become obliterated by mirage, even with the best $3000 spotting scope glass. and also, at this distance, i really do not need to know how far off from center i am because my bullet grouping (dispersion) at this distance is greater than that target size anyways - hence, i do not need to measure the target center to bullet strike distance because the bullet strike coordinates have much greater dispersion than if i were shooting say, a target at 600 yards where the group size is only a few inches. i mainly look for a dust cloud to see where i am hitting (if off due to windage or whatever) and measure the correction using the FFP scope. - that is to say, i say that a hit is a hit. if it is dead center, i consider that a chance of the draw over skill. you'd have to measure 20 rounds of strikes and do an average to determine where it is truly aimed at and then make the correction off an average grouping over just a single shot.