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Do not use Remington no.7 small rifle primers for .223 Rem. They will pierce. It says on the primer box not use them for high pressure rounds. If you use Remington primers use the Benchrest or magnum Small rifle primers to avoid problems.
I load a lot of .223 for a bolt action. I also have loaded for several friends that have AR rifles. I use the RCBS Small Base Die for the inital full length sizing for the loads used in them.
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No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.
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