The TRG-S is a very well made action. I'm pretty sure that you are stuck with the factory stock though, so I hope you like it. As for the round itself, it used to be something pretty special, then Remington invented the .338 Ultra Magnum, and Weatherby legitimized the .338-.378. The .338 Lapua isn't in a class of it's own any longer.
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<br>The cheapest I've seen brass is from E.A.Brown, and they want $1.37 each, if you buy over 300 pieces. Plus shipping.
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<br>You might want to post this question on the Long Range forum. Or not...
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<br>Scott