I’ve been looking for 5.56 pressure load data for the Nosler 64 gr. BSB bullet but they don’t publish any, only .223 data. I have been able to find 5.56 load data for Speer’s 62 gr. Gold Dot bullet and Hornady’s 62 gr. bullets. The .223 max loads for Gold Dot 62 gr. and the Nosler 64 gr. are very close - with CFE 223 they are identical. Based on that similarity, could you use the Gold Dot 62 gr. 5.56 data to load the 64 gr. Nosler bullet - assuming you used the same case, primer, etc as the Gold Data data?

The variables I can think of that might affect pressure are case, primer, powder charge, and seating depth. Variables I am wondering about are friction as a result of bullet bearing surface and ductility of the bullet due to the Nosler BSB being a solid copper base versus the Gold Dot's plated construction.

Speer Gold Dot 62 gr. .223 Loading
C.O.L.: 2.23”
Hodgdon CFE 223
Min.: 23.4 gr. (2,889 fps)
Max: 26.0 gr. (3,141 fps)

Nosler 64 gr. Bonded Solid Base
C.O.L.: 2.26”
Hodgdon CFE 223
Min.: 24.0 gr. (2,633 fps)
Max: 26.0 gr. (2,932 fps)

Speer Gold Dot 62 gr. 5.56 Loading
C.O.L.: 2.26”
Hodgdon CFE 223
Min.: 25.1 gr. (2,848 fps)
Max: 27.8 gr. (3,088 fps)

What am I missing? Thanks.