Hi guys and gals , sat in on my sisters safety course and the guy had a little a4 target he said was used for f class or big boar to sight in a rifle for various ranges . it had a 1-2 inch black dot with a graduated ladder above it that had set ranges for .308 each so you could dial your rifle up to 1000yard wile at 25 yards and have it pretty close ? Any Ideas on what they are called or where I can get a copy? Any he'll would be great
PS . I have searched Google and can't find any thing .