Are "what" still available? The bullets themselves or the (complete) loaded rounds?
The only places to find the loaded rounds would be like the following three.
http://www.ows-ammo.com/
http://www.buffaloarms.com/browse.cfm/4,4229.html
http://www.gadcustomcartridges.com/
If you're looking for bullets for reloading, the following three would be the main ones for a tubular magazine, as they all have cannelures. For other magazine types, bolt actions or single loading in tubular magazine guns, one could use just about any .25 caliber bullet.
http://www.speer-bullets.com/ballistics ... aspx?id=23
http://www.midwayusa.com/viewProduct/?p ... 1601461247
http://www.hornady.com/store/25-Cal-.257-117-gr-RN
On a side note, I have a couple of .25-35 Winchester (Models 94 and 1894) rifles and my father also has one (1894) that my grandfather owned. Anyway, many years ago, I "acquired" some of the OLD ammo that my father had laying around......some were flat-nosed hollow points and some of the others were flat-nosed solids. The reason I "acquired" them was that I recognized that they were very rare and I was afraid that either he or my brother might actually shoot them up. I've kept them as "historic artifacts".
Some years back, I had some e-mail discussions with someone at Sierra Bullets and during the exchange, asked about whether adding a flat-nosed 117 gr. hollow-point .25 caliber bullet (with cannelure) would be feasible. (I gathered it would not be) Subsequently, I sort of lost interest in pursuing that option with some other manufacturer like Hornady or Speer........then I acquired a "significant number" of the Hornady 117 gr. round-nose bullets and lots of brass......before the prices skyrocketed.
I have experimented with a few other bullets, but pretty much settled on the 117 gr. RN as my load of choice.
Den