Late in this thread, but I relocated the table of PTL Blank Coding and Ratings.
So here it is as copied:
"I repeat the Color code below copied from another post:"
"In brass casing:
Color-coding (Velocity)
(1)- Grey 315 ft/s (96 m/s)1.31 grains propellant
(2)- Brown 385 ft/s (117 m/s)
(3)- Green 490 ft/s (150 m/s)
(4)- Yellow 575 ft/s (175 m/s)
(5)- Red 675 ft/s (206 m/s)
(6)- Purple 755 ft/s (230 m/s)
In nickel (silver) casings:
(7)- Grey 845 ft/s (258 m/s)
(8)- Brown 935 ft/s (285 m/s)
(9)- Green 1,025 ft/s (312 m/s)
(10)- Yellow 1,115 ft/s (340 m/s)
(11)- Red 1,205 ft/s (367 m/s)
(12)- Purple 1,295 ft/s (395 m/s)"
I have also run across a Brass cased Blue coded Load but do not remember where I saw it or what it's relative Power level was."
The Propellant measurement was added later, and was measured on a Balance Beam type Powder Scale.
Chev. William