Well I tried two current production molds about 2 or so years ago and of course they cast undersized at .449 to .450. Midway was excellent in taking back both molds, paid return shipping, and apologized for the problems. Anyway so I came across a late 1960's/early 1970's 4 cavity that actually cast fat .4535-.4540 which is fine for my needs. I knew there was a design change but never seen it first hand. The recent production molds are not only equipped with undersized cavities on many of their molds but the 452374 design is skinnier/longer in comparison to a more standard ball type round nose. I much prefer the older design.
Left is the 60's/70's and the right is the current