93x64mm, I used to shoot cast in my Ruger No.1 in .404. As I recall it had a bore of .422 and I used a NEI .421-390 gr GC sized to .423 in a CBE push thru sizing die with Hornady .44 GC. The Ruger had a long throat and this projectile (cast hard, approx Lyman #2 alloy) shot quite well at around 1,800 fps. Still have the mould & sizer (see #233 .421-390 page 9 of the NEI Handtools online catalog), drop me a PM if you are interested.
Spud