30-06 was a big thing with the US in WW2. Used with infantry weapons (Garand, BAR) and I’m pretty sure snipers gladly used it too. Hard hitting, reliable, quite a kick. Used by hunters today. People are working on modernizing the BAR. A neat idea. Probably performs pretty well.
.308 (7.62x51) is the go-to caliber for moose hunting these days. Also popular with designated marksmen if we’re talking military.
Dunno if anyone uses .300 anymore. Maybe? I know .300 BLK (.300 AAC Blackout) is one the rise but that’s a bit different. Supposedly a 5.56 slug in a .30-cal casing. Lots of upgraded AR-15 platforms use it.
If we’re talking realistic steps forwards in military applications, 6.8mm Remington SPC (6.8 SPC) should probably be brought up. Dunno if it’s in the game already but it should be. The missing link between 5.56 and .308. An all-rounder.
Oh, and the G11 was pretty much a just an overhyped working prototype. Something to show that caseless ammo can be a viable choice. It’s huge, unwieldy and you’d NEVER find ammo for it. The game having “modern” caseless weapons just makes sense. Someone picked up on the idea of caseless ammo, took it a bit further and left ol’ grandpa G11 in the dust.
SAM-R is 5.56, SR-25 is .308.
This thing is likely to see a lot of action over the years. Pretty small package, accurate. Plus, folks seem to like the AR-15 platform. Not quite up to snuff with an SR-25 but it doesn’t have to be. It ain’t a sniper rifle.