No more Krag brass?  My Hepburn in .40-70 Sharps Straight uses Krag cases reformed & stretched.  But now Hornady is making something like a .405 Winchester in some sort of basic length.  If Krag brass can be stretched, the Hornady basic stuff can be necked down & trimmed.

2 days ago, I saw a Lee-Enfield that had been converted to .223.  The owner/builder said mainly it was just a technical challenge, but was done also because of ammo availability.  Discounting action strength, could you do that with a Krag?