well.
this sounds like a simple question..s.
but in reality this is actually where the rubber meets the road when it comes to hand gun loads.
JW and Ben have you on the right track with the advice to use the amount of room left in the case to guage/gauge whatever,, whether you can use the data from another bullet or type of bullet.
it isn't always about weight, how much in or out is a bigger influence especially with the faster powders you use in a pistol.
if you were asking and wanting to use something like clays or titegroup i wouldn't say anything but hell no, neither of those powder do well in small spaces.
extremely unwell, and will go so far as to spike pressures about 3 times higher than you'd think possible from nothing other than the smaller space available to them.
Unique not so much.
as far as using Jacketed data?
maybe.
quite often lead bullets are more efficient at blocking the gas behind them so show higher pressure levels than jacketed bullets do.
their pressure mapping will be higher until the point where the pressure drops off faster because the engraving pressure and barrel friction are lower.
so the answer basically comes down to burn speed of the powder, it's base ingredients, and how much below maximum the jacketed load is,,, in other words not really 100% predictable without testing.
then in the next case it doesn't matter enough if you use one or the other...