For every other case but this one, your techniques rule. The fact that the .25 firing pin will usually also hit the rim of a .22 makes this one unique.

In the reformed Hornet case I like 1.9 grains of Bullseye.  Of the powders you listed I'd go for 1.9 grains of 231.  The others are too slow for this tiny case.  The reformed Hornet is about two grains of water smaller than the rimfire case.

Phil

Thanks guys. Unfortunately no Bullseye, I've just never had a use for it before.  I may have others that are suitable, I'm at the office today and don't recall for sure.  I'll look when I get home to see if I missed anything.

I now have 4 different versions to try, all using the .258" diameter, 49gr Hunter Supply bullet. L-R:

Reloadable case made from .22 Hornet. .22 starter pistol blank primer, 1.9gr WW 231.

Converted .17WSM rimfire case, 1.9gr WW 231.

Medium length .17WSM case. These were cases that the neck split when trying to expand. They were cut off at the shoulder and are now .925" vs 1.125" for .25 Stevens. Loaded with 5.8gr APP 3F.

Brown #2 .27 cal nail gun blank. Bullet will be breech seated.

I hope to get to the range Friday afternoon to try them out. I'll bring the chronograph.

Steve

Sure is!  

Converting a .32 rimfire block is tougher than a .22 rimfire, but it can be done.  I've done a 1915 Favorite, so it now handles .32 Colt CF quite well. 

Meanwhile I've swapped a centefire breechblock into my .25 caliber Model 44 . Only function-fired so far as my bad back has precluded any range or even chrono testing.

According to my Quickload studies, over 1700 fps should be possible with a 60 grain bullet.   Best powders for this look to be magnum pistol types; Blue Dot, 2400, AA#9, 4100, Enforcer.

(Strong rifles only, not for most boys' rifles. Pressure is ~ 20kpsi.)

Personally I'm inclined to keep to ~1400 fps, and plain base bullets.  Pressures drop to ~ 12000 psi.  if you use AA#7 or 2400.  Still not safe in boys' rifles. Well, maybe your #4 roller if it's good and tight.  Maybe a tight 1915 Favorite, but definitely not an 1894.  I'm going on results from my bolt thrust calculator. 

Never pass up spare parts!   

Which is why I can barely get into my gun-room.....

Great video, thanks for doing this one. I was a bit surprised at the higher velocity you achieved with the brown nail gun load, the green ones seemed quite mild in my 44 1/2.

I recently bought a stripped Stevens model 44 high serial number frame cheap, yesterday I received a late model full round .25 Stevens barrel I bought from a guy off of gunbroker. Sometimes  you get lucky, it had a shiny excellent bore, plus it indexes perfectly in my frame. I have all of the parts to put together a rifle except the hammer and trigger, it would be nice to have a centerfire breech block to make it a centerfire version of .25 Stevens, but I do have a .25 RF breech block to use, or I could swap out a centerfire block from another rifle temporarily.