So it's hard to tell one small grain extruded from another, but a surefire way to figure out is get the Volumetric density.
If you have access to one of the Lee powder measures (the yellow plastic things that come with some of their dies), you can fill that to the top, level the powder, then measure it on a scale.
Your VMD is going to be the volume of the powder dropper (probably in cm^3) divided by the weight of the powder, in grains. You will probably end up with some number between .05 and .1. You can then look up the VMD of common powders here:
http://leeprecision.com/cgi-data/instruct/VMD.pdfBe warned - many powders are very close to one another. When you look like you have a couple of powders that are close (within .005 or so), then look up the physical descriptions. They should be short grain extruded or cylindrical powders. Then, look up similar load data from that powder's supplier. If they have reccommended loads of 50gr and 23.5gr, then you ought to be close.
Fair warning that not all powders used are commercially available, so use caution and safe reloading practices to try and replicate the load.
EDIT: Looking up data on H322, that might be a good bet. Seems like you have about 1.7cm^3 of powder, which is about the right case capacity for a .223 cartridge. Hodgon lists 50gr loads between 22 and 24gr, so that might be a good bet to replicate.
EDIT 2: Of course, some of the other small grain extruded powders (taken from this list below) all show VMD around the .071 range. So we may not have gotten you any closer to the answer.
Short Grain Extruded powders:
H4831SC
H322
Benchmark
Varget
Hybrid 100V
IMR8208 XBR
IMR 4007 SSC
IMR 7828 SSC
Accurate Rifle Powders (all)
Alliant Reloader powders (all)
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