Sorry to hi jack your thread.
Honest answer is that Norma 205 was discontinued in the late 70's. Norma MRP showed up on the scene just about the time 205 disappeared.
The Speer #9 was put out in 73.
Burn rate of 205- MRP, 4831, RL22 are very close.
The data Roscoe put up will be about the last book it was in, so will also be your best bet.
If not, then would start on the low side of MRP data and work up.
