I love studying load data from the past as it is often quite different than the load data of today. It is fun to note that most of the loads from way in the past are heavier than today. It may be due to having better and more accurate testing equipment or it could be that they reduce load data due to legal reasons. After lots of reading and a little Googling I have added the following two load manuals to my library and I thought I would share them with everyone else. There is a lot of reduced cast load data in these older manuals. Most of the reduced loads are only somewhat reduced and not greatly reduced. But there is some greatly reduced load data in these two manuals.

Here is the IMR Handloader's Guide from I am guessing the early 2000's:
http://pdf.textfiles.com/manuals/FIREARMS/imr_reloading.pdf

Here is the Ideal (Lyman) Hand Book No. 38 from 1951:
http://www.nzha.co.nz/wp-content/uploads/2015/08/IdealHandbook38.pdf

Enjoy!!!

Did they sell jacketed bullets back then?