Originally Posted by max
I would use lead bullet data.
That's right; Rainier specifically states this:
"Q6. What if I can't find load data for your bullets?
A. If you have a load for a cast lead bullet, that will transfer across the board as far as our bullets go. We recommend a starting powder charge directly between the listed minimum and maximum load."
If you haven't already got one, pick up a Lee Factory Crimp Die. You will be very pleased with the results when used with plated bullets.