The WRF's available through CCI and Winchester. I get them at my LGS for about $11. a box including tax. I keep a standing order for the ammunition.
I rescued an old '86 .38/70, which indeed is a rare bird, back in the 1970's. A friend of mine bought it from me and added it to his extensive Winchester collection. The .33 Win. was a great old shooter with a mite heavier bullet that the old .30/30. Kicked harder to.
Being a delicate antique I notice things like that.