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I prefer lower power. I'd go with a fixed 2.5x Leupold or a 1.5-5x Leupold. My 458 is an "irons only" proposition, but my 416 Rigby wears a 1.5-5x Leupold. It's becoming one of my favourite scopes. I'd put it on damned near anything.
i have a leupold fxII 2.5x fixed 'scout' scope on my 45 70 guide gun, and im very happy with it, its IER, and you have to be something like 6-8" away from it, its comfortable for me in that position too