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Ar-15

11K views 29 replies 6 participants last post by  WisconsinDeer  
I have reloaded the .223/5.56mm for many years. primary arms being fed were the Colt AR15 and the Remington model 700 varmint special. I never gave any regard to interchanging cases designated .223 or 5.56mm at any time in either firearm. in fact all loading data at the time made no significant mention to variations in case dimensions.

I did however follow the advise of a friend who was an armorer in the army. keep the velocity in the AR15 to 1800fps max. in keeping with that criteria, I am sure the pressures mentioned were never even close to being achieved.

one significant difference in the two cases worth mentioning and hold true with the .308/7.62mm NATO as well is the fact that the primers in the military surplus ammo is crimped into the pockets and before reloading is attempted, the primer pockets must be swagged. RCBS makes a primer pocket swagger for both calibers. this process must only be preformed one time for all subsequent reloadings.