Unfortunately you'll have to work out what suits YOU best as you'll get several different answers! I'm currently using 30yards so I only have two aim points using low mounts but others use 25, 35, 40 (or whatever suits THEIR rifles power and scope aim points)
Rick Ardern. RIP mate, never ever forgotten!
Currently in stock........
Steyr LG100 x2, Ripley AR5S x3, hw77 x2, hw80 x2, hw100, hw97, hw98, Walther Dommie, Walther LGV, Stoeger x20s .22, Daystate mk4 in a custom laminate stock, Diana mod 50 + Gamo compact & Röhm twinmaster pistols