Allan,
I recommend you watch the following video on you tube it will answer your question I believe. It tells the story behind SWFA and their scopes and how a self proclaimed "scope geek" has used, abused and tested the SWFA 3-15 x 42 scope. In short if you don't want to watch the video. He mounted the 3-15 x 42 scope on his FAL. He tested many different scopes on that platform to get them to fail. Prior to testing the SWFA scope, the only scope to last for any significant duration was a $23.00 air rifle scope from Wallmart it lasted 500 shots before it went bad. He fired as many or more rounds from the FAL with the SWFA scope mounted on it and it still did not fail. I got the impression that the cost of ammunition was keeping him from testing further. IE; the SWFA scope was the only one the FAL could not kill. I have the 10 x 42 on my RAW .357. Put it on there for the specific reasons: one I will be carrying, hiking / climbing around the desert and mountains in Az and want something that will withstand a little bumping around. Two the glass is very nice and I really like the "quad' mills. The mill dots are diamond shaped outlines. So when you are trying to hold on a small target at range you can see the target inside the "quad" mill. It is not just a dot that could cover and or make smaller targets hard to distinguish. Just my 2 cents worth.
