If you are relying on your original brass to reload, and don’t want to fight the primer pockets, don’t get NATO crossed brass... like LC or anything with a military nomenclature (M193, XM855, etc.). If you are buying once-fired brass, from Top Brass and others, make sure it is ‘processed’ brass, that means it’s been sized, trimmed, and primer pocket swaged to remove the crimp. I have had serious issues with ‘once-fired, processed’ brass in .308, and I don’t normally recommend it. .223 brass is a little different, and it would probably be ok, but understand you don’t know the source or even the brass head stamp, it won’t all be the same.
I only load MY once-fired brass anymore, and that includes .223, even if it means punching out the primer pockets. I have the C&H Tool, similar to the RCBS I believe, it’s ok, but I would recommend the Dillon if you have any sizeable stash to process.