Reloading 223 Remington is really no different than handgun, just a few different steps.
The most simple method, reloading rifle cases uses a two die set, one that resizes and expands the mouth at the same step and then the seating die. Generally speaking, if you set up the seating die as the die instruction say, your cases will fit your rifle.
Rifle cases need to lubricated when resizing, both inside the case mouth and the outside. This is true even if you get a carbide sizer die. Carbide rifle sizer dies are really made for the high volume reloader who reloads enough to wear out a steel die. Unlike Luke Skywalker and his reward money, we cannot imagine what alot of cases would be that would wear out a steel sizer die.
Also, you will want some method to clean the lubricant off the cases.
Bottle neck rifle cases need to be trimmed periodically. The act of shooting and then resizing tends to make them grow. Trimming is done after resizing. So, some type of trimming system is required along with a set of calipers for measuring the case and setting up the trimmer. Also, a debur/chamfer tool is handy for cleaning the flash off the trimmed case mouth and a little chamfer inside the case mouth helps with bullet seating.
You might want to get a case gauge. They measure shoulder position and overall length but they are not chamber gauges. Most commercially available case gauges are cut generously in the body diameter dimension. They are handy tools. I reloaded for decades without one though.
Charging the case is similar to hand gun although the small neck of the 223 Remington can make using stick powders a bit more difficult. Bridging in the drop tube is the main problem with stick powders. Of course, a scale and some kind of powder delivery system will be required for charging the case.
Seating the bullet is essentially the same although there is generally no flare on a rifle case. Many folks do not crimp their rifle ammunition but there are many different opinions on the subject.
There are many tools and techniques that can be done while reloading rifle cases that can make small, incremental improvements in accuracy and consistency. But, the above is the basics for making good ammunition. Most hard bound reloading manuals should have a section on reloading rifle cases.
Hope this helps.
