I've seen people claim triple 7 isn't
Venom1956 said:Also '209a' primers wouldn't be considered corrosive either would they?
Federal® No. 209A Primers…
The No. 209A Champion™ Primer is particularly adaptable
to a variety of powders. The basic lead styphnate mixture,
a Federal exclusive, is non-mercuric, non-corrosive, and
stable over extreme ranges of temperature and humidity.
The 209A provides instant, full, and dependable ignition
with uniform ballistics...
http://www.federalpremium.com/pdf/FP294_ShotshellReloadingData.pdf