psteinmayer wrote on Jun 8^th, 2019 at 2:32pm:

Fascinating!  I'd be interested in knowing how Laflin & Rand transitioned through the years to other companies, and what became of the original W-A 30 (we know that IMR-4350 is as close as you can get now).

I am dubious about the alleged near-equivalency of IMR4350 to W-A 30 for the basic reason that the normal charge of 34 grains* of the latter for an MV of ~2000fps in the Krag 30" rifle is significantly lighter than we need for the same velocity with 4350. The 34 grain charge indicates the burning rate of W-A 30 is closer to that found in today's IMR4895.

Data from Sierra manual -
.308 220 gr. RN
Cartridge OAL: 3.000"
Krag carbine, 22" barrel [so 1900 fps is equivalent to ~2000 fps in 30" rifle]

M.Vel - - - - - 1800 - - 1900      
IMR-3031      31.5      33.1
IMR-4895      32.0      34.1
IMR-4064      34.3      36.0      
IMR-4320      33.3      35.3      
IMR-4350      38.2      40.2
IMR-4831      40.1      42.3

* Source for 34-grain charge is reply #1 here -   (You need to Login