When was H-110/W-296 released? One of my old Speer manuals (might be #8) shows hotter 2400 loads than H-110.
I started loading in 1978 and H110 was around then and it was a surplus powder. I may still have one of the square black & red paper containers somewhere. W296 was available about that time also and was manufactured by Olin. Back then they were two different propellants and, as a matter of fact, W296 even smelled different than H110. That said, data for the two was so similar that it was, for all intents and purposes, identical. Over the years, the H110 containers went from saying "surplus" to "newly manufactured" and then nothing. Today, H110 and W296 are the exact, identical propellants made in the same location but with different packaging.
Maximum charges of H110/W296 will almost universally give significantly higher velocities than A2400 with the same case & bullet. Usually, they get the accuracy edge also. In addition, perceived recoil with H110/W296 seems lower than A2400. Finally, you won't get those hard little unburned kernels of propellant all over and in your gun when using H110/W296.
Some folks criticize H110/W296 because it is not suitable for reduced loads and, in fact, must be used exactly as listed in Hodgdon's data. Maximum charges should not be reduced by more than 3%-which is atypical to most other propellants. It also requires a magnum cap plus high neck tension (bullet pull) and a very firm roll crimp. The neck tension is
BY FAR the more important of the two. In view of the fact that I find these to be superior propellants, it is a non-issue for me. I have never had a leading issue when using these propellants with plain base cast bullets of high quality.
For what it's worth.
Bruce