|Federal brass, Remington 7 1/2 primers. Factory chamber, not SAAMI min chamber.|
We had our family Christmas this evening. I took some .223 Remington reloads with 55 grain Sierra BlitzKings to the White Elephant exchange. They were well received.
Sierra Load Map Bolt Action
Sierra Load Map AR
Western Powder (Ramshot and AA powders) : .223 Rem data starting on page 45-of-114. 5.56mm NATO starting on page 48-of-114. .223 Rem is loaded to a max pressure of 55,000 PSI while the 5.56mm NATO is loaded to a max pressure of 62,000 PSI.
Hodgdon Reloading Data. Requires inputting data.
A link talking about primer cup thickness. Thicker primer cups are preferred for semi-auto with floating firing pins and for 5.56mm NATO pressures
Ramshot Powders Frequently Asked Question.