Video of the event can be seen here;
The results surprised me. I was expecting around 8 jugs worth of penetration. Instead the 250 grain Lee 379-250 RF passed through nearly NINE feet of water before coming to rest in the bottom of the Eighteenth jug!
The bullet was fairly soft cast, roughly a 20/1 alloy, the load chronographs a very consistent at 1506 fps (average), propelled with the excellent SR 4759 powder at well below (3+ grains below) the RCBS cast bullet manuals starting load. The meplat on the bullet expanded to .285" from .250"
Pretty impressive for a cartridge that was introduced in 1876.