Seems OK for lead but is steel a problem? Do you have any correspondence from Beretta on using steel shot in your particular shotgun and up to what size through it? 1960 is long before the use of steel! Thanks ----
"Steel is ok in these" And you have what info to back this up? Steel isn't even approved for much more than .020" constriction in modern choke tube guns. I'll bet this nice old 10 is at least .035" constriction.