Hodgdon's 2023 Annual Mannual (been buying these since 2004) (.45/70 Trapdpoor loads) lists starting load for .45/70 with:

:405gr.Cast and 5744 as 24.3gr. 1,226fps and 14,500PSI
The maximum was 27.0gr. at 1,394fps and 16,100PSI.

:420gr.Cast and 5744 as 25.6gr. 1,210fps and 14,500PSI.
The maximum was 28.5gr. at 1,375fps and 16,100PSI.

:385gr.Cast and IMR4198 as 31.0gr. 1,405fps and 15,000PSI
The maximum was 33.0gr. at 1,491fps and 17,400PSI

:385gr.Cast and H 4198 as 28.0gr. 1,302fps and 13,300PSI
The maximum was 32.0gr. at 1,483fps and 14,700PSI