Another primer substitution question

[B. Dudley]

To me, primers are primers.

[Pa SxS]

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.

[Kensal Rise]

Originally Posted by Chuck Bishop

... 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.

Good advice. And why not simply contact CCI and ask THEM if there's any practical difference? They will be happy to tell you. Legally.

And please do NOT sub a Federal 209 for any other in a load. Federals are good for about .5 grs. addition powder strength.

[Tom Flanigan]

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.

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.