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Tell that to Ed from Alliant - THEY have the pressure testing equipment. Many primers are easily and safely interchanged with no appreciable difference in velocity or pressure. Others are not. Standard primers such as Win, Nobel Sport, Fiocchi, Cheddite and similar are interchangeable. Do not swap hotter CCI or magnum Federal or Remington STS with the others.
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Shotshell Primer Comparison
Winchester 12-Ga. 2-3/4" AA Hull
17.0 Grains IMR 700-X Powder
Greenduster GT 9210-12 Wad
One Ounce No. 8 Lead Shot
Primer and Lot Velocity f.p.s. Chamber Pressure p.s.i.
Fed. 209A 03513 1251 (EV 14) 10,860 (EV 600)
CCI-209M D03C 1248 (EV 22) 10,460 (EV 1300)
Win. 209 NFL124 1246 (EV 22) 10,140 (EV 400)
Rem. 209STS 1236 (EV 16) 9,740 (EV 2200)
FIO-616 1234 (EV 28) 9,690 (EV 1600)
CCI-209 B032 1232 (EV 30) 9,650 (EV 2300)
Rem. 209P 127 1228 (EV 34) 8,810 (EV 2200)
Fed. 209 A8702 1226 (EV 18) 9,070 (EV 900)
Win. 209 MDL542 1224 (EV 30) 10,200 (EV 1700)
Cheddite 209 1217 (EV 20) 9,270 (EV 2000)
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Well. I'm sure Ed from Alliant is aware of the Lyman shotshell reloading manuals, so maybe he should take this issue up with Lyman.
Even the data you have furnished shows a variation in pressure that should give a reloader cause to think very hard about the possible consequences of interchanging primers.
Have Alliant published anything stating that. 'Standard primers such as Win, Nobel Sport, Fiocchi, Cheddite and similar are interchangeable.' If so, please show me where.