If you're looking for evidence that one cannot rely on brissance rankings, examine about any .410 data. The 209A, mighty in 12 ga applications, is an also-ran.
Of all the blithe, "off-data manual" component substitutions that can be made, primer substitutions are arguably the most perilous.
I use STS209s, Win 209s, and Fed 209As. But I am under no delusion that they can be randomly substituted. Each has advantages. STS209s tend toward the lowest velocity ESs. Win 209s give me best results in the 28, and are now the only primer I will use in AA .410 comp-formed hulls. For low-temperature conditions the 209A is king. YMMV.
Sam
Last edited by Samuel_Hoggson; 12/31/06 02:25 PM.