I-too prefer a backward slant on the sight. The sight picture is almost always clear, whereas a bright sun can almost blind on a shiny 'edge' of a foreward sloping sight.
: If the gun was to be used in darkness, the foreward slope would help somewhat to see it.
: Rod - I suspect the 9.3x62 will beat the '57 by about 200fps, both with normal max loads. The '57 should be slightly more efficient, but they both use powders of similar burning rates. Ball powders don't normally do well with short barrels, but actual testing it the only way to find out - as with most ballistics questions.