hopefully the 308 m-die will work on the 30-30 either way I load a lot of 308 so it wil be used regardless .
Just to be clear, the LYMAN M Die I am talking about is a "universal" die body. It never touches the case, all it does is hold the expander plug assy.
And that's where it gets specific, by caliber. Not cartridge. What you need is "any" M die body, and the .30 caliber expander assy for .30-30, or any other .30 caliber cartridge.
The M die is the middle die in Lyman's 3 die pistol sets, and if new is out of stock, a die body can often be obtained by buying an old Lyman 3 die set. Even a trashed/rusted "Unusable" die set will usually provide a serviceable M die body. (for cheap).
The key is getting the proper LYMAN expander assy. IF those are out of stock, then you're out of luck short of the classified among reloaders to find someone who has one and will part with it. Alternately, you might be able to get a larger expander and have it turned down to the diameter you need for .30.
Good Luck!