For the long action, a 6.5x55 swede or 6.5x284 seem more appropriate (and would fit into the bolt head). For the short 6 mm cartridges I'd start with the right system with all the money and labor you plan to put in.
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I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.
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