Same brass, same primer, same trim length, seating depth was 0.020" off lands for ELD, and 0.030" off lands for RDF. From what I'm told, I haven't measured, the bearing surface of the ELD is greater that can cause a higher pressure than a lower bearing surface bullet like the RDF. Regardless, the pressure is there, and in my case way over pressured with the RDF at 2,900+ fps. The ELD I noticeably saw the pressure signs and backed off.
But to your point, those two things can also cause a variation in pressure.
