I've only gone out to 300 but the targets I'm using are all basically a shoot/see type, with large black backgrounds. Definitely not white or any light-colors. In daylight the black gives me better contrast than any other color, and the splatter will show up. There are times of day or types of sun etc that don't work for whatever, but IMO your choices should center on big (12-18") black shoot/see types. There's a bunch of those like on Amazon, the ones I found were rectangle like 18-20" tall and ~15" wide, with I think 3" oblong style between zones, and a big red center area. I don't see the red that well but the black comes in good.
Edit to add, you can get those "plastic cardboard" type real estate signs that use stick-in-ground steel wire-signholders, and bulldog paper clips to clip them to the sign, to post them up at desired distance, just push the sign onto them and push in the ground.
Edit to add, you can get those "plastic cardboard" type real estate signs that use stick-in-ground steel wire-signholders, and bulldog paper clips to clip them to the sign, to post them up at desired distance, just push the sign onto them and push in the ground.
"Down the floor, out the door, Go Brandon Go!!!!!"