Any one have any reference or experience with N-200 or N-203?

I have several NORMA booklets with info for j-words, but nothing for CB's.

Little info available,especially on N-203. I found reference to N-200 in the LEE manual's Burn Rate Chart. It is rated,N-200,#56(one place slower than Accurate 1680,#55) and H4198 is #59.

N-203 is a little harder to find info on. It appears to be the first of the 5 rifle powders to become obsolete. NRA Handloader's Guide(1969) pg 83,shows a chart comparing NORMA and US (IMR)powders shows N-203 as just faster than IMR 4064.

Thanks in advance for any input.