Ash - I did not say the .348 was based on the .45/70's case.

I did, however, say the .348's rim was the same diameter as the 45/70, as below.

Sorry for the misinterpretation of my post.

"Siamese does OK with the .348 case, as the rim is the same size as the .45/70 - just less difference from body head to rim diameter. "