I'm trying to make up my mind on a new spotter purchase. I'd like to be able to see 5.56 shots on paper out to 300 yards. It is down to the Razor 16-48, Razor 20-60 or Viper 20-60. The Razor 16-48 has a great deal available right now, but concerned the 48x is not enough to easily see hits on paper out to 300. Can anyone with old eyes like mine give me a definitive answer? I'm not very young anymore and my eyes are approaching 50 years old and don't work as great as they used to, but I'm not in glasses yet. Thanks.