I have owned several 7mmremmag rifles, several 7mmstw rifles and two custom 300RUM rifles. You don't have ammunition loaded with 139gr TTSX for your 7mm remmag, because there is no such bullet. As for using the 130gr Barnes in a 300RUM for 1000 yard shooting, you would be hard pressed to pick a less suitable bullet for that distance.
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Only accurate guns are interesting.
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