I'm fairly skeptical of camo schemes painted on the rifle. I could see it as useful for personalization or "coolness". Possibly even if you only use the rifle for hunting in a specific terrain at a specific time of the year. For sniping purposes, a flat base colour scheme is better, and then spend the money on several sets of nets, cloths etc. The advantage is that the nets, cloths etc are interchangeable, break up the contour in a better way and thus becoming more versatile. Not to mention cheaper.
But once again, I'm talking from a military perspective.