Harper wrote:Yep, 30WCF win is the 25-35's parent case.
Rebarrel.
I believe the black powder 38-55 first used that case type with 12.85mm rim, then came the dirty-dirty & 303 Savage and a bunch of others, 32-40, 7-30, 375 (most recent)...
The 25-35 is based on the same case by all references, but the rim is larger by exactly 0.5mm (same size as 9.3x74 intrestingly)
For info the 32WinSpec. uses a similar case again but with slight difference chamfer on the rim while the 219Zipper and 22 Sav use the same case with zero rim chamfer...
What is your motivation for going the 25?? surely you could pick up an old lever in the chambering for a lot less than the 30-30 conversion??