FITZ, I have an 1896-vintage hi-wall with a small shank 28" #1 weight barrel in .38-40 WCF. I have never hot-rodded that round in it (why would one do that?) and assume that the combination is strong enough for any reasonable load in .38-40 (or .44-40--I've seen one chambered for that powerhouse, too). What do you think?

I assume that the weakness of your .30-30 in the small shank barrel is the same as the Martini Cadet--too thin a wall in the chamber area (threaded area)?