49th edition of the Lyman Reloading Handbook page 103. 300 grn projectile and 13 grn Trailboss.
Good article with a bunch of load data
https://www.loaddata.com/articles/PD...0%20pearce.pdf
Be careful which loads you use, a lot of the newer published ones are for shooting in modern Uberti and the like replicas. The originals are NOT near as strong.
Lymans 2 and 3rd edition cast bullet handbook has loads for the originals.
Let me know which you are looking for repro or original.