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Attaching a scope on a rifle does not magically change that rifle's effective firing range.
It does. Thats why its called the "effective" firing range.
Not the maximum firing range. That's something different and scopes don't change that.
The Effective firing range is the range where you can hit targets easily. A scope drastically increases that.
And it's a hell of a lot easier to see a man sized target at 700 meters with a scope than it is with iron sights, let alone attempt to make accurate hits. Especially with something that isn't very flat shooting, like 7.62x39 which was never designed to engage targets out that far to begin with(meaning you take all the help you can get).
Historically speaking, I don't think many SKS's were ever built with side rails attached to begin with. I'd guess that's something that was added on later to some of them to extend their service lives, but I could be wrong.
Well there is 77 Grain 5.56 which has a better ballistic coeffecient and of course is heavier than the standard 5.56. Increasing its stopping power a bit and penatration slightly. As well as drastically increasing its effectiveness at range. However I only know of one nation who has standardised 77 grain 5.56. Since it was originally a sporting round.
Plus a lot of Western nations are simply implementing full sized 7.62 NATO these days on the fireteam level. DMRs and LMGs.
The SKS at range also wasn't terribly great. 7.62x39 also suffers pretty early. Not as badly as 5.56 but good luck stopping anything at over 500m. Not to mention it looses speed and accuracy faster at range.
And after recent conflicts 7.62 X 51mm rifle in a squad is not a bad idea to cover that dead zone 5.56 sucks at. The Russians have been doing that with the SVD for the past 4 decades in 7.62 X 54mm.
And dont go crazy about the 77 grain rounds in 5.56. Against a guy with no body armor it will work fine. But its going to be even worse than a 62 grain M855 or older 55 grain M193 in close range against modern ceramic or harden steel body armor plates. Speed kills armor more than anything else. Which is why a 124 grain 9mm round will not go threw kelvar. But a simular sized +p 125 grain .357 magnum vary well might. Or for that matter a 55 grain all copper 9mm round will too. Let alone real armor like sapi plates. Another thought on armor VS bullets. At 300 meters back there in the 80's an m193 round could not even punch threw a warsaw style steel pot. Although at like 50 meters could at times get threw light armor on armored cars. Its that speed kills again. At 3300 FPS that round is smoking close in. But looses velocity vary fast as it lacks mass. A strange situation where a larger round like 7.62 nato ball ammo could not get threw 9mm hardened armor plate on light armored vehicles but the much smaller and "less" powerful 55 grain ball vary well might close in. The extra 700 feet per second was what was doing it. OK that was random....
Also Rather a lot of nations have a DMR at the fireteam level.