With a Squad Common Optic on a spotter/radioman role with the static overwatch, going with 7.62 is almost automatic if available. Keeping the support/security element (which will include these) in supporting and overwatch role in MOUT seems intuitive enough for me, but with a shorter (16" 7.62 with collapsing stock, offset irons/T-1) SDMR rifle it's no longer such a handicap.
Beyond that, penetration>>volume of fire for a precision weapon system in my experience, yet another point to the 7.62 for this role. Even in built up areas with limited lanes of fire, the odds of tangos using thin/intermediate cover aren't too bad, so while I can imagine a case where a Recce/SPR in 5.56 could shine, an M110C/417C in 7.62 isn't far behind, and provides a much bigger capability set outside those.
If an M240 and M110C is a squad level asset, I think that's an adequate force multiplier (based on my experience with corps 13-16 man augmented squads). Since the majority of the direct fire weapon platforms (M4; M249, M27) in the squad are already in the assault and support elements, that's more than enough. With a solid division of responsibilities, the SDMR in a larger caliber shines in most situations.
Moving to smaller unit, and civvy oriented stuff, then you're looking at the 7.62 recce as a more significant tradeoff, where for smaller units the added capability of the 7.62 may not be worth the tradeoff in effectiveness closer. In open terrain, 7.62 all day. Built up areas, I'm at a loss.
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