I don't know what maker BA is but the 63 usually denotes the data of manufacture, 1963 in this case.
Yup.
RA=Remington primers.
FC=Federal '' ''
WCC=Winchester " "
Determination of corrosive or non-corrosive characteristics based on the primer type should consider these final headstamp dates of corrosive ammunition production:
.45 ACP: FA 54, FCC 53, RA 52, TW 53, WCC 52, WRA 54