I have used similar reticles with success. I used a 3-9x40 Bushnell with the diamond reticle and I love it. We call it the diamond of death. Fast acquisition and easy to use at those kinds of ranges. I am currently running a Nikon 4-12x40 Coyote special on my .308 AR-10 and love it. They may not be the best at tight groups, on paper, but they sure allow fast shots on moving targets. I dropped a coyote at 287 yards while it was at a full sprint. Made it a lot easier.