My less than scientific quality tests conducted by loading four rounds and shooting two at an indoor range at 70 deg, and then two outdoors in colder temps ~12 deg, ~17 deg, and all measured by Magnetospeed:
12 deg
200 Hot Cor, TAC (-100 FPS avg)
200 E-Tip, TAC (-71 FPS avg)
185 TTSX, TAC (-68 FPS avg)
210 Partition, 2000MR (-61 FPS avg)
17 deg (sat out all night at 9 deg)
210 Partition, 2000MR (-25 FPS avg)
AA2230 lost 90-100
Leverevolution lost 43
Powders that lost less than 10 FPS are 8208 XBR, RL16, IMR 4451, H4350
The idea that different cartridges has some merit in that RL17 lost nothing on the 338-06, but lost 63 FPS in the 6.5 Creedmoor. Data points of four rounds for each cartridge. Hardly conclusive.
