Very nice! That kind of answers the original question too.

Only the (relatively) newest one I have (a 696-1) achieves a .429 throat and bore.
I suspected that if you went back far enough one would encounter the proper specs to account for the legendary performance.
I am still looking for the real story of why S&W (and others for that matter) made the 44 throats and bores larger and larger till they reached .433 in the mid 1980's.
All 3 624's have throats about that size and my Redhawk from that era is .432.
Then slowly the throats and bores miraculously get smaller over the next 20 years till we are back to where they should have been all along.
Properly loading cast bullets .433 is not completely straightforward.
I have ended up with 3 different expander stems of increasing size to match the 3 different bullet diameters I stock.
As it turns out the microgroove 444 also likes those big bullets.
I guess I shouldn't gripe too much however as the 45 folks have seen bore diameters all over the map since the beginning.
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Nemo