>I was think maybe something in the 5mmx49 might be a better option for engagements close and far distances. Against M855 (190gr) 5.45 7N6 (162gr) weighs nearly 30 grains less per cartridge which is 85% of the weight of a somewhat comparable 5.56 round and probably even less against heavier rounds like Mk. It's almost 33% less weight for the bullet at least. With standard commercial lead only ammo, it matches Mk. 5.45 has a better and more reliable deformation process that causes early yaw, especially so with hybrid steel-lead core rounds like 7N6. 53gr 5.45 matches 77gr 5.56 terminal ballistics and BC as well.
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