300 win mag is better for larger game. 7mm rem mag may be a better deer rifle for open country,
In general terms, more or less the truth, but also, in general terms, what one will do, so will the other, given the right bullet selection in either.
The 7mm does handle bullets below the lightest generally used in the 300 & conversely, the 300 handles heavier bullets than the heaviest generally used in the 7mm.
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