I have one on my 257 Roberts.
80gr ttsx's smoke out of it.
Sighted in for 300, you get 400, 500, and 600 out of it.
I shot an antelope doe at 550 yards with it.
Member Chip on here, was with and did the ranging.
Hit her 3 out of 3 shots, holding between 500, and the the thick to thin point.
Another trick to get even more distance, but you must practice, is if over 600 yards, say 700, hold the thick to thin point on the plate, and look where the 500 yard dot is.
Raise the thick to thin point to that spot, and send it.
It'll thwack the 700 plate !
Try even further with holding other dots.
You'll be surprised !
