I don't load for .204, but would guess in all fairness, that those could be used for lower pressure starting level loads, but not likely your "normal" load... & of coarse as already mentioned, the .243 uses LR primers...
BTW... FIL started out using those for bolt action 223 & 17 Remington ( like 20 years ago, probably before Remington put the warning on the box ) but transitioned to either Bench Rest, or Magnum primers...
you could also see if you could find someone who might be willing to trade, considering how hard all primers are to find right now ???
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