Well, I did say comercial burn rate charts, which does not include those put together by individuals for their own use.
OK, so RVO sold the powder to you as comparable to IMR 4350. That's a starting point.
Did RVO give you any info as to the particular burn rate of RVO-62 compared to IMR4350. Something like "burns alittle faster than IMR4350, burns exactly the same as IMR4350, or a little slower than IMR4350". IF so that should dictate how you use IMRs load data. If they said it burns a little faster than IMR, then you would take IMRs load data and reduce the load by say 10% and work up from there. If they said it is exaclty like or slower than IMRs burn rate then use IMRs starting loads and work up from there. The whole idea here is to use comercialy availabe load data from a reliable source, such as Hodgdon, IMR, or Alliant to name a few. Once you have a place to start the rest is easy.
Incase you don't know, Hodgdon, IMR, and Winchester load data can be found at http://data.hodgdon.com/main_menu.asp