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During the late great ammo shortage, I have been seeing 300 Win Mag and .270 Win on shelves - mostly available during all the drought. 30-06 has been spotty at times but more limited for some reason. I haven't seen WSM or 7mm on shelves anywhere in a couple years.
You have the 243 already so any of the three (270 Win, 30-06 or 300 Win Mag) are good starting points. 30-06 can be handloaded for some bigger game. I don't see once-fired 300 Win Mag around but .270 Win and 30-06 are plentiful most of the time and lots of bullets and data for reloading. - cosh
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