Quote:
Originally Posted by Chuck Bishop
To my knowledge, CCI makes 209 and 209M (Magnum) primers. Use the Reloading data which calls for that specific primer. Substuting primers when the load is at high pressure to begin with can be dangerous. Use published data.
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I agree completely, especially in the small bores with their higher pressures. The regular CCI primer is mild. Much more so than the hot Federal Primers and others. The CCI 209M is a hot primer in the Federal league. Substituting a recipe for a mild primer like the standard CCI or Remington can raise pressures significantly with little or no increase in velocity. The Lyman Shotshell Reloaders Manual has a nice study on the different primers and their effect on pressures.