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Looking in the Hodgdon reloaders manual--what would cause the need to use less powder with a CCI 209 primer vs a Win 209 primer using Clays & TGT 12 wads in a Rem hull. The CCI requires 16.6 grs,while the Win uses 17.6 grains---to get 1180 FPs for a 1 oz load & the CCI pressure is much higher--just curious---

Lou
 

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CCI209 is a mild primer, the CCI209M is a hot or magnum primer. These are the two CCI primers made and you will know the difference if you try both.
 

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A "hot" primer does not always generate more pressure. Depending on powder, a Fed 209A sometimes produces less pressure than the Winnie 209.

Use published data. Some powder companies will say that certain primers are interchangeable.
 

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Different primers will give different results in different loads. Sometimes a primer that was thought to be mild will increase pressures dramatically. That's a great example of why you need to use reliable data. Even then, It could be a bit of a crap shoot.
 
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