Hondo,
I won't argue with them or with you. I don't think they would do it otherwise. But consider that a .38-55 is considered marginally too big for an original low wall by really well informed folks (like John Campbell) AND that the back of the block is unsupported (perhaps the geometry of the new walls are different than the old ones in this respect), and that's why I find it amazing, and I just don't think steel differences (standard rationale) can be all that great. But what do I know?

I ain't arguing, in fact, I'd buy a .243 low wall if I could find one at the right price - for my wife.

Brent