Geargnasher, I was searching on the internet as to why big cannons have such small rifling grooves. I didn't find an answer, but never the less I found some very interesting things, at least to me. Do you know what the rifling twist was on those 16 inch guns on the U.S. battleships? One turn in 25 inches. I was shocked. I thought it would be slower. The muzzle velocity for the AP rounds was around 2500 fps. The nuke rounds velocity was around 2700 fps. Number of shots before the rifling liner had to be replaced was around 394 for the AP rounds, little higher for the nuke rounds, and the practice rounds was a very high count. Now watch me swing this right into line with the cast bullet forum. Think of barrel life they would have gotten with cast projectiles! What do you think Geargnasher, single or multi-cavity mold? LOL Average weight of powder charge was 600 lbs. Wow! They must have had one heck of a huge powder measure.
The Navy certainly had enough Beeswax to make their own lube if they shot cast. So would we consider that HV?