I need information on making 300 BO cases from 223? To what length do you cut the cases before running them into the die to shape the shoulder and neck? Any other data I need? I have an upper on the way but can't find the ammo. No cases in stock either. I have once fired 223 and can pick the best so I can get at least 100 finished cases to load. I think it will be Federal cases unless I have enough Remington. Some are already polished just waiting to be loaded. TIA. Be Well, RZ.

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