Buy the 850, if you're unable to get animals that detect your red-eye then you could be making noise / taking too long. I don't think I've seen a single large game animal instantly run when I've been detected at night by the laser.
I exclusively use 850s and have even purchased external 850s/808s lasers for tighter beams/better clarity at longer distances. Mounted the same as Zerkpak but on adjustable mounts so they can be better focused.
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