I just looked at a brown box of bulk bullets from Midway that only says "Rem .38 Special bullets" and that's all it says. I happen to know it's 125 gr Golden Sabers in there, but I also know that there isn't any Remington data for that bullet, because Remington doesn't publish any data.
If I use data for a Sierra 125 gr JHC, or an XTP, it should work just fine. However, the reverse isn't necessarily true. The Golden Saber is a bore rider with only a small driving band that's bore diameter and the rest is groove diameter. That configuration will produce less pressure than a non-bore rider, like everyone else makes. So, what I work up for the GS is not necessarily safe with an XTP, Gold Dot or Sierra JHC.
If the DEWC example is followed, it should work fine, but that doesn't always hold true for every bullet, especially jacketed bullets.