thanks everyone for your help.
I finally stop my choice to the Vortex Vyper pst 6x24x50 ffp MRAD. I will use it for long range precission target shooting. I put it on my Remington 700 5R .308 Milspec with a Cadex competition series butt. With your help I think a made the good choice because I tried it in the moment at 600m and it shoot verry well. I'll shoot at 1000m and more soon.
