Montana Rifle Company
I can't speak regarding recent production but MRC built me a S/S barrelled action in 325 WSM before any were available, anywhere else. I had to handload ammo working backwards from a recipe a guy gave me for his 338 WSM wildcat as no ammo was out and no load data had been released.
My first set of 3 rounds were melting a miniscus on the primer dents. I had loaded several sets of 3 with 0.25 grains between them. After going down to the 4th set it disappeared, so I went down one more for good measure and stuck with that. That load pushes a 200 gr Nosler partition 3110 - 3150 fps whenever I chrono it. This tells me that the first 9 rounds I put through it were damn hot and the load I use is still pretty hot.
I took it to Namibia and was the first person to tag any african game with the cartridge. Two Kudu, two Gemsbuck, Hartebeest, wildebeest, impala, waterbuck, zebra, eland, a lot of warthogs and a whole bunch of jackals. Back here its taken several mulies, and a nice 6X5 Elk. I've put a handful over 250 rounds through it and have not had a single problem. I was really quite pleased with the barrel (octagonal hvy sporter taper). It shoots better than I do. If I bench it they all go MOA or a little less unless I screw it up. So far no signs of any problems with the action whatsoever. They were great guys to deal with. I had Seregeti put it in one of their 5 piece laminated stocks. I love it. All that said it is hard to go wrong with one of those FN actions from CDNN.