Right, back to business.
The hold-outs look good. I dunno how long the case of a .22 Win Mag is, it might be a bit hard to fit into a very small pistol -- assuming Morrissey Elan is a pistol. And it may well be that it's not significantly longer than that of a .22LR, so it's not really an issue.
Beretta 101T and 200ST: Unless you consider them hold-outs, I strongly urge you to change them to at least 9x19. You won't easily find a
Beretta in such a weak caliber -- only the sub-compacts come in calibers like that, and some of the compacts offer that option, but none of the medium or full frame pistols come in anything weaker than a 9x19 (excluding the practice kits in .22LR).
Ceska vz/120: I believe this gun is modeled after the
CZ-pistols, and apart from the practice guns and one compact gun, they all come in at least 9x19. None is chambered in 9x18 Makarov. Of course, if you consider the Ceska vz/120 to be something very different, like a crappy, compact pistol meant only for gangers to shoot walls with (like most soviet-design pistols are IRL..), then making it 9x18 Makarov is quite OK.
The Hammerli is, AFAIK, a competition/target pistol, and a Swiss one at that. I find it extremely unlikely that they'd chamber their guns in an old Soviet military caliber. If you wish to keep it a small caliber gun (which is apparently what
Hammerli mostly makes), make it .22Win Mag or .22LR. If you want to make it a larger caliber gun, make it 9x23 Winchester or 9x19. Something like that.
I have no idea what country the Seco gun is supposed to come from, or what kind of gun it's supposed to be, so 9x21 IMI is as good for it as any other.
I doubt Ares would chamber their machine pistols in such a weak caliber as the .32ACP. .380ACP seems more likely, if not 9x19 (all machine pistols of western design that I'm aware of are chambered in 9x19: Beretta M93R,
Glock 18,
VP70M). The Steyr TMP I already dealt with in the above msg.
Caseless ammunition demands huge changes to the internal workings of a pistol, so if you want to consider the Browning Something-Power series to be a same kind of closely related family as it's made out to be in canon, I suggest you put .45ACP for the Max-Power.
I see you seriously up-tuned the Cavalier Deputy.

That's totally fine, there needs to be huge-caliber made-up guns in the SR world.

The FN 5-7C probably shouldn't be Velocity Controlled (as far as I know, the RL
FN Five-seveN isn't meant to be suppressed, though it's probably possible), although dropping the Damage Code by some measure to account for the very short barrel might be in order. 7L/-? 7L/+1? Something like that.
Beretta Mod 70: All Beretta SMGs, from the WW2 1938A to the current production
Model 12S, are chambered in 9x19. I don't see this trend breaking, at least not in the favor of a round as sucky as the 7.62x25 Tokarev.
The Colt Cobras: 9x19 or perhaps even something more powerful, like 10x25 or 11mmC. These are supposed to be used by the UCAS military and SpecOps around the world, .32ACP is way underpowered for that kind of use.
Ingram is a good ole US firm, so they're likely to make their guns in 9x19 instead of 9x21.
Sandler TMP: Well, since it isn't really the Steyr TMP, I guess you can chamber it in any old weird-shit round you want to, but I am still of the opinion that the .30 Mauser wouldn't be used in any non-antique weapon in the 2060s.
Teeheehee @ Steyr AUG/CSL! I can see why it might have caused problems.

Don't worry, the 5.6mm F ammo should be extremely expensive, hard to get and easy to identify as mil-tech, so it's not that overkill.

The Remington 990 is supposed to be a common hunting and "general purpose" shotgun, so 12G would make more sense. The rest of the shotguns are good, and I don't really know enough about shotguns to say anything more about them.

The H&K G38 is supposed to be a rather average assault rifle, so 5.56x45 or 5.5C might be better than the 7.62x51. Of course, if you wish to make it more of a battle rifle (not meant to be fired fully automatic/burst = doubled recoil, perhaps better ranges, perhaps heavier), 7.62x51 is great.
The .375H&H is not that common a round, and even then it's (AFAIK) almost exclusively a hunting round. For a large caliber sniper rifle, .338 Lapua might be better. 7.62x51 and .300 Win Mag might be better for Remington 750/950, so that there are some mid-caliber hunting/sporting rifles, and not only long-range and large-caliber rifles.
The Walther MA-2100 in CC is made out to be a rather average military sniper rifle, and that combined with the fact that the RL
Walther WA-2000 was originally chambered for .300WinMag, and later 7.62x51 and 7.5x51, leads me to think that .300WinMag is probably the best caliber for the WA-2100. .50BMG is not really a sniper rifle round, but an anti-material rifle round, and as such not exactly best suited for an army's main sniper rifle (which is what the MA-2100 is supposed to be for the CAS).
The assault rifles are fine.
T-5h 58min. W00t!