A few of us were silly enough to waste ammo shooting 1000 yards at Ridgway. Coyote silhouettes, sitting/howling, 18" across the base and 24" tall, so basically a triangle with a cutout behind the front leg. The best I was able to do was hit 2 in a row and rock the 3rd. There are 2 E-W valleys between the firing line and the 1000, and no way to read the wind. Close misses are the norm, and I can often see my own impacts in the dirt through the scope. My normal shooting/spotting partner and I both shoot 30-06, 20moa tipped bases, Burris rings with +/- 10 inserts, scopes with 125+moa elevation and mildots. 311299s are my bullet of choice and he shoots 314299s. I HAD shot Saeco 301s, but the 311299s require less elevation.
That same rifle was my "production gun" for the cast bullet silhouette match 4060MAY alluded to. Its just an older Rem700ADL, that's never been bedded or free-floated, just had the trigger adjusted. The aluminum buttplate isn't particularly shoulder friendly, but I'm not modifying that rifle. Last year I was coerced into shooting my 300BLK AR in the match. I built it, so had to shoot "silhouette class" along with the guys shooting custom guns, heavy barrels, etc. It weighs 7-1/4# with Vortex Viper PST 1-4x on it. At the of the day I was tied for HOA, but lost in reverse animal count to a guy shooting a Tom Gray built Rem722 in 35Rem with 36x Leupold and 250gr Saecos.
I set the NRA BPCRS long run record for turkeys back in 2001. 32 consecutive turkey silhouettes fell at 385m/421 yards, and they are just slightly bigger than a basketball. The rifle had tand/globe sights and was chambered 40-50 Sharp bottleneck, shooting Goex ffg.