primer pocket O ring

TN hunter

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Oct 4, 2007
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I am shooting a CVA apex and was wondering if anyone uses an O- ring in the primer pocket to help decrease blowback from Blackhorn 209. If so. What size O-ring do you all use. Thanks.
 
Thanks frontier gander. I just ordered some. Do you have any data redarding rio primers? I cannot find any CCI 209 magnum primers anywhere.
 
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