H110's twin is Win 29-something(297?), sorry don't load pistols anymore.
http://www.thegunzone.com/556prop.html
Remember there are several "issues" to keep in mind here.
1) who made who.
Olin has been out of the propellant (and brass) game for quite a while. Hodgdon has switched powder suppliers a few times in my life, but the location (of ball powder) remains the same. What I do know is that WC846 & WC844 differ only in the potential for CaCO. Technically they are identical, but the original patent of 846 has a large allowable swing. Meaning they CAN be different, and CAN be the same.
2) Why ask why.
Was the production run contracted, or was the powder surplussed? If surplussed, why so? Hodgdon has only ever been a reseller/blender. So depending upon why the powder got to Hodgdon, and what they will allow, there can be differences.
3) testing and burn characteristics.
While QL is a nice tool for this, Hodgdon REFUSES to give info on what the BR variation is, our give him any useful info. Because of the contract dispute between Olin and Hodgdon, ANY current info for Win powders is from an outside tester, not those selling it. A powder of that era has a standard BR variation of about 5%. Meaning potentially a real difference of 10%(if you have a slow lot, and a fast one). That is why EVERY manual ever printed tells you to drop 10% and start over when changing powder lots.
Of you look at burn characteristics in QL from the powders that Hartmut tested (win & Hodgy ball powder), you can see that 748 appears to be slightly different. But only just. So it is my ASSumption that that is due to the anti copper agents. Grab all of your manuals over time, where you KNOW the company did their own recent pressure testing. For one example only, the Nosler manual (2nd most recent) and follow the 846/844 family lineage in all cartridges. They are within 5% of one another. Does that make them identical? Certainly not, see the argument against that above about blending. But it sure does play into my case of them being essentially the same, and from the same parent powder.
As another interesting bit of knowledge. French defense contractor Thales, via their ADI layer; contracted with US defense giant General Dynamics. They were after production help, and powder construction help. GD builds all Win/Hodgy ball powder in Florida. ADI builds Hodgy's extruded line.
Here is a little comparison chart they have since put out.