A 6.5-20 scope is a nice scope to have for out there, but during the heat of the day you usually cannot go over 16-18x due to the mirage. So your current scope will work just fine.
My first trip I used a fixed 10x Leupold on my 22-250, and shot out to 600 yards with it fine. The extra power just makes it easier to dial in on the longer ones though. Last year I used a Vortex Viper 6.5-20x50 to shoot out to 850 yards and had no troubles. Very good scopes at decent prices. I now have 4 of them.
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