In medieval times R905 was N205. This was 20 years ago when MRP was not born.
It's quite obvious MRP was around almost 30 years ago, which is all I was addressing. Of course, we also don't have a lot number or an age for the R205 in question, so we don't really know if it's newer manufacture or not.
This quote
Do any of you have data from older reloading manuals listing R905,
suggests it isn't newly made powder, for which the old N205 would be appropriate.
