People might think the old .30 Remington is obsolete, but ammo is still being made occasionally and the BRASS is still a production number. Reloading dies are available from a number of manufacturers, starting with Lee Precision and RCBS.
I can't say that I have ever heard of or seen any modern production ammo, and certainly none by the major manufacturers. Can't even find the stuff listed on American sites. I know that dies are readily available (I picked mine off the shelf at WSS, last/only one though), but I cannot find any brass or ammo that isn't NOS stuff.
Very interesting old rifles, these are. Fire control/safety is the same as the AK-47, BTW!...
Hey there mister history, chicken calling egg!

The AK47 has the same safety as the M8, Klashy pilfered the idea from John Moses Browning and shamelessly reshaped to use as one of the most iconic features on the AK.
I must say, the M8, and subsequent M81s (and the very rare FN Model 1900s) are some the damn finest and coolest rifles ever manufactured. I own a 1917 M8 in .30 Remington and it is a hoot to shoot. makes a terrible bench gun due to the long-action and the rather sharp tang sight, but has very light recoil when standing and it is downright fantastic that the old girl is 95 and works as well as day one. A little worse for wear perhaps, but plenty beautiful.
I should add that I paid $400 for mine, but had to get the safety replaced. At some point the rifle discharge with the safety in the SAFE position, horribly bending the lever and detaching it from it's pivot. The subsequent "repair" meant that the trigger need only travel about .010 before she fires when in SAFE. Scary stuff, but got an NOS lever assembly for a good price.