What will happen when shooting shorts in a long rifle chamber is that you will have a carbon buildup in the front of the chamber where the short cartridge ends. Shooting a few may not cause too much of an issue but doing so on a regular basis can cause chambering issues when chambering a long rifle cartridge.
drover
223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.
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