Xausa:
Remington is still making the .30 Remington cases and they are available (or were about two months ago when I purchased some). All it takes to make them work is to run them through a .32 Remington expander die. You can neck them down for .25 Remington as well. Just be careful not to get the similarly named .30 caliber cases for the AR-15 platform.
Buffalo Bore is loading a .321 diameter 170 grain flatnosed bullet in these cases and selling them as loaded ammunition. I bought a bunch of them, too, and am quite happy with the way they shoot in my 141.
Rem