I did read the entire thing, and increased damage doesn't mean much.
Anyway, what about people who play on higher difficulties? Headhunting with a pistol is a good way to finish off a horde, or thin it out before switching to a shotgun when they get close, which is no longer doable with 7 shots before reloading. The SMGs doing very little individual damage coupled with very high fire rate was pretty much the point of having SMGs in the game, if anything their fire rate should be increased (the MAC-10 is notorious for its 1100+ RPM fire rate). I understand your point but making all guns more average (i.e. slow firing powerful guns like the AK become faster and weaker, and opposite for the SMGs which become powerful and slower) makes it feel like I'm playing Black Ops, where every gun is a reskin of the previous one. Increased accuracy with shotguns is a bad thing if you did it on ALL shotguns. Increased damage at range would be nice, but up close is just overkill, though not a con in itself.

Balancing weapons so that they're all pretty much the same in terms of overall effectiveness takes a lot of interest away from the game IMO. It's boring when all you have to do in order to do good with a weapon is point and shoot. But maybe that's just me.

Do you have a 45-round fetish or something? You should add a video, or way more info.
I'll take the Silenced SMG for instance, beyond the fact there's no box magazine compatible with an Ingram MAC-10 that holds 35 rounds, its original values are 960 RPM and 25 damage per shot up close. According to your "picture", increase in damage and decrease in RPM could mean it now deals AK-47 damage at the fire rate of the Magnum. Increased accuracy for shotguns could mean they have built-in laser sights, or that they're now sniper accurate.

Why not altering the three weapons you left out?

I like the idea of changing weapons' stats but you need to spend more time on it, do some research and multiple tests, as well as ask people to betatest it for you.

7 bullets for the pistol makes it unusable, I understand it's more realistic but this is a game, and unless it deals 100 damage per shot or something, it's gonna be pretty unusable.

Meat for VAC. And... Beretta with 7 bullets? Hmm...
I din't like this. Sorry!

at least add a video ¬¬