I stop the range yesterday to throw the bull with a few fellow shooters and was given a few hundred rounds of cast 38-55 (900 rounds) from beartooth and laszer cast in .379 and .380 diameters.
The gentleman who gave me the lead stated his older H@R 38-55 slug at .3775 and shoots jacket ammo excellent
The gun will drive tacks at the 100yard target and he had no need for the cast bullets.
This guy must of got a excellent bore when they made his 38-55