So, for firing a 5.56 bullet out of a 223 Rem all you are doing is putting a bullet with about 4,ooo more lbs of pressure in it into your mix. I'd recommend always always always always shooting the Cartridge that is stamped on your barrel. What you will find is 52gr, light hearted rounds will shoot well in all .223 REM rifles. 55gr. are good too and can usually be found in most shops. 62 and 69 gr are for us accuracy freaks that want alot of range on our .22 cals.
Plus If you are reloading your brass within correct SAAMI overall length with taylored powder and primers, you are essentially creating a 223 Reminton.
Just a little Tidbit. The two ammunition types for the AMERICAN INDUSTRY STANDARD are 52gr. Federal American Eagle, and Black Hills 55gr. These two loads have always shot well in my rifles, weather Semi Auto, or the Savage 12bvss.
Everyone has their own loads. Just don't try and create 5.56 for a 223 Rem. Make your ammunition match the 223 REm Dimensions and Pressures for better accuracy.
My savage 12's are all 1-9 twist rates, but I sadly cannot say what your twist rate is. In my own rifle the above loads shot great at 800 yds, The 52gr. Sierra Match King with 25gr. Varget, CCI BR primers, FC brass shoot Excellent groups at all ranges.
Take care and Good Luck with your reloading
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