I happened upon a few hundred Remington 6 1/2 small rifle primers, however, all load manuals list .223 loads using 7 1/2 primers. What is the actual difference between the two if any? Are these ok to use in place of the 7 1/2's? Duke
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.In rifle cartridges, the 6-1/2 small rifle primer should not be used in the 17 Remington, 222 Remington or the 223 Remington. The 7-1/2 BR is the proper small rifle primer for these rounds.