The Lyman 50th Edition Reloading Handbook lists load data with a maximum of 13,000 copper units of pressure (CUP) for weak actions such as the Winchester Model 1873 and higher 22,000-CUP loads for ...

Trustworthy load data is rather limited for the .257 Ack. Imp. The Nosler Reloading Guide 9, though, contains plenty of reliable information.

Many turkey hunters load their own high-performance shotgun ammunition with Tungsten Super Shot (TSS) and Hevi-Shot, but reloading improves performance for all shotgunners.

Using data science, one of the largest 3pls, C.H. Robinson is able to offer carriers loads before they ask for them.