358156 hp
At large, whereabouts unknown.
new guy here I could not hit a barn with them but may try again now that this has come up.
Hello Bruce, and welcome. Like many Lyman designs, there are slight to not so slight variations of 357446. They all seem to prefer being driven fairly hard. As Ric mentioned, this bullet was intended to correct to a degree issues with other designs for 357 mag. The most popular version I'm aware of is possibly the least commonly encountered, the same basic design, but the front driving band is full bore diameter, and about twice as thick as the earlier versions.