Ted do yourself a favor go ahead and get the 10 x SS standard. It is a great scope. No it does not have the glass that the higher price scopes have, but for the money you will have a reliable scope with decent glass that will stand up to your 50 cal. They also hold their value very well if in the future you decide you want to step up in glass quality.
I have a 16 x and it does well for me as far as quality of glass. Sometimes I wish I had the 10x when mirage is bad. It could be a good option for you. I think you sight picture would prob be better all around with the 10 x.
Have fun and enjoy your 50 cal.