Bit of a necro, but getting back to the topic of weapons that use other ammo types…
Bare with me a moment. I’ve only been playing GZ for about a year, actually a bit longer than that, so I missed how things went when Alpine Unrest first landed. As I understand it, from the description of that DLC, the KVM 59 and KVM 89 were added to the game as part of that DLC… Were those belt-fed MGs, at that point, ONLY available to owners of the DLC? But then, in some following update, were introduced to the base game and made available for everyone? Or was that not so? If that WAS the case, then there is precedent for DLC items being made base game items, no longer DLC-specific…so, say, the 9x39mm ammo could become base-game, and the AS-VAL (AT-WAD) sniper relative, the VSS Vintorez, could be added as a weapon included in a free update for everyone, a new part of the base game. That could come with an overhaul/rebalance of weapons and ammo, to make the 9x39mm weapons/ammo more competitive, among other slight changes. That’d also mean experimental ammo types could become a thing for the 9x39mm, further improving parity with other weapons.
Setting aside whether DLC stuff could be (re?)integrated, other weapons could be added as part of free updates to the base game, anyway.
I’m not too familiar with what all might be out there for the .243 cartridge, but yes, there have to be some other options, and they might not all be bolt-action. As for .270, there are plenty of bolt-action options, but there are also semi-auto options. From around 1966, Browning made a semi-automatic hunting rifle called the Browning Automatic Rifle, not to be confused with the Browning Automatic Rifle used in WWI, WWII, etc. The hunting rifle featured a low capacity detachable box magazine that fit onto a floor plate which was ‘permanently’ fitted to the bottom of the rifle, which swung down and forward. In .270 or in .30-06, magazine capacity is four rounds—.270 and .30-06 are related cartridges, so the same magazines are used in those cases. It can also be had in other chamberings, possibly to include .243—a quick search might confirm that. For a bonus, the BAR is also a rather nice looking rifle.
And it isn’t just the two hunting rifle cartridges that are underutilized, of course. .44 magnum, we could see the addition of the Auto Mag as used at one point by Dirty Harry, or instead the other Hollywood darling, the Desert Eagle. Both of those were produced in versions compatible with .44 magnum, worthy competitors to the revolver already in the game.
I’m also of the opinion that we could use another shotgun, and I think the SPAS-12 might be just about the perfect answer. It’s got the look, it’s another Hollywood icon, it’s a local boy from Italy that was also used by France I believe, both of which could be dropping lend-lease or surplus goods to the Resistance, and the SPAS-12 also has an absolutely perfect basis for an experimental version already out there—the shotgun used by ‘the Driver’ (played by Charlie Sheen) in the 1980s sci-fi/fantasy punk racer movie ‘The Wraith’…
As for a .50 cal, maybe a bolt-action this time. It could even be a Russian one, converted to use the NATO ammunition already in the region. No need to add a new ammo type, even if it might be more correct to do so. They could always change the name of the ammo to make it more generic, “12.7mm” instead of “.50 BMG”…