7mm Rem Mag or 300 Win Mag rifle better for long Range shooting?

I had been shooting 30-06 so far but now i wanna upgrade my shooting and wanna get a more range covering rifle for over 500 yds.So what would you suggest me to buy among these two?what rifle twist and barrel length would you recommend on these calibers.So far i've studied,all the ballistic charts were for 22"... show more I had been shooting 30-06 so far but now i wanna upgrade my shooting and wanna get a more range covering rifle for over 500 yds.So what would you suggest me to buy among these two?what rifle twist and barrel length would you recommend on these calibers.So far i've studied,all the ballistic charts were for 22" barrel do you know any web site were they have it for 24" barrel also .thank you
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