Some of it could be gleaned from prior postings, or the
2006-2010 Steel Safari match reports. But I'll run down what the guys in the photos were shooting. Since this was just training/practice/fun and not competition, some of them were using their secondary LR rifles for whatever reason.
I shot my AI-AW in .260 Remington. S&B 3-12x50 PMII, TBAC 30P-1 suppressor. 26" Rock Creek barrel. Load is a 139gr Scenar over enough RL17 for 2875 ish fps out of my now 5 year old barrel. This is the exact same setup I used to win the SS match in 2006 and "open" in 2007 (other than the newer suppressor). This barrel is almost toast, but it still shoots great "most of the time". But I'm losing 25 fps every couple hundred rounds.
The guy in the first photo was shooting a Lawton action and barrel in a Tac Mod stock, with a Leupold on top. Cartridge was .300 WSM shooting 168gr Speers at like 3080. His suppressor was the YHM, which was notably louder than my can.
The guy in the fourth photo has what is basically a Remington, chambered in .260. I don't know the exact model of stock. Nightforce on top. Load is probably 142s at 2850 ish.
The guy with the camo stock and the grey TBAC shirt has a Surgeon .260 Ackley with a USO on top. TBAC 30P-1. Load is 142's at probably 2940.
The last guy (spotting for the Surgeon shooter), I don't have a photo of him posted, he's shooting a Remington in .308 with a Nightforce on top. 175's at 2700 fps.
In the past, I've shot my .308 (even with surplus ammo to boot) on the course for practice or "shoot in" (prior to the match).
In the SS match reports from 2008 on, I have equipment surveys that include cartridge used.
If you like what you saw here, the "Similar Threads" box below the reply box should have a list of five other threads I started in the past several years with similar stuff, shooting, rifles, locations, etc.