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An upper in a more significant round is a much better idea, especially for hogs. Not sure if one can be had still in 6x45mm, but it’s a fairly good round allowing some of the heavier .243” bullets. I always felt the 6.5mm Grendel was about the best round for an AR sized magazine as it really holds up well for longer ranges. But the 6.8mm SPC is also pretty good. Even a 7.62x39mm would work nicely. Not to mention the big calibers like a .458 SOCOM, .45 Bushmaster, or .50 Beowulf if you really want to hammer them.
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