It concerns me that occasionally one doesn't go off per KPH. Academy also had Federal 209A. Researching through the internet last night, apparently the hotter ones(Federal 209A, CCI, etc.)can slightly push the load up the barrel, which isn't a good thing. Here the data on the different primers:
Shotgun Primers
Winchester 209ML ........................221 f.p.s.
Winchester 209 Triple Seven ML......244 f.p.s.
Remington 209 Kleanbore ML .........318 f.p.s.
Std. Winchester No. W209A ...........336 f.p.s.
Remington STS.............................338 f.p.s.
Std. Remington No. 209 ................341 f.p.s.
Cheddite No. 209 .........................347 f.p.s.
CCI 209M.....................................379 f.p.s.
Federal No. 209A ..........................381 f.p.s.