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What’s the best way to open up the feed rails on a Remington 700?

Mram10

Cast Iron
Joined
Dec 17, 2017
I had a 7mag that I turned into a 300 ultra mag. I’m curious what the easiest way is to open up the feed rails for the wider cases. I’m leaning toward a 1” wide fine file and go slowly till just over .550. Thanks

Also, what tool and method to open up the feed ramp? Again, thanks
 
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