"Full steam" ammo is likely going to be European. Norma makes some. The calibre is still popular in Europe and modern rifles chambered for it are reasonably popular. The US doesn't really find it popular as a sporting calibre so you tend to find more old mil surp there hence the "softer" loads so they dont get sued.
My old one really liked the Sellior and Bellot, which was handy as it was also relatively inexpensive. (I dare not say cheap with ammo....)
https://www.norma.cc/us/Products/Hun...ler-Partition/
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