Goosehunter82
As stated above you NEED reloading manuals, and when you get the manuals you need to READ the front part of the manuals to gain information.
You then should start with the suggested starting load and work up, I would load 5 cases each increasing your load a half grain at a time until you start nearing maximum and then only increase your load .2 due to the smaller capacity of the .223 case.
When you start at the bottom and work up you examine each fired case for signs of pressure, learn to read the case and primers for signs of pressure. The manuals are guide lines and each rifle and the reloading components you use will cause the chamber pressure to vary.
Below is the same load of 25 grains of H335 and a Hornady 55 grain FMJ bullet fired in cases with different cases capacities. The low pressure chart is our American military Lake City Army Ammunition Plant cases with the most internal capacity at 30.6 grains of H2O. The higher pressure are from cases with a internal capacity of 28.8 grains of H20, there is 6,000 psi difference in chamber pressure between these two type cases. This is also "WHY" you start low and work up until you know more about reloading and get to know your firearms.
Below the Lake City case with 30.6 grains of capacity.
Below this case has 28.8 grains of case capacity and the chamber pressure is 6,000 psi higher than the Lake City case.
What these two Quickload charts tell me is with 25 grains of H335 and a 55 grain bullet using mixed brass fired in my AR15 rifles is that the Highest pressure is still 5,000 psi below max. This would be short range practice/blasting ammo for under 100 yards, for accuracy loads you would want to use the same type and lot brass for case uniformity.
Again start low and work up your loads and learn the read your primers and brass for signs of pressure.................know thy rifle.
Changing any component can and will change your chamber pressure as the primers show below.
I'm retired and have been reloading for over 46 years, and every year I pick up at least one of my manuals and read ALL the information in the front of the manual. This keeps everything fresh in your mind and replaces any information that may have leaked out of your ears.
