I ran across this article
https://ultimatereloader.com/2018/08/05/223-vs-5-56-facts-and-myths/
Here is the section im interested in.
“Load data for 223 Remington and 5.56 NATO is not the same! Use the appropriate load data for the case you are loading.”
If the cases are within 1% dimensionally and you use the same bullet profile. why would the load data not be interchangeable?
From what I gathered from the article , the main difference between the two is the free bore in the firearm itself and not the actual cartridge. he pointed out specifically the 64 grain tracer rd and it’s different shape vs XM193 or 55FMJ bullet.
So if I use a standard 55FMJ in 223 case. Why Couldn’t you use 556 load data?
https://ultimatereloader.com/2018/08/05/223-vs-5-56-facts-and-myths/
Here is the section im interested in.
“Load data for 223 Remington and 5.56 NATO is not the same! Use the appropriate load data for the case you are loading.”
If the cases are within 1% dimensionally and you use the same bullet profile. why would the load data not be interchangeable?
From what I gathered from the article , the main difference between the two is the free bore in the firearm itself and not the actual cartridge. he pointed out specifically the 64 grain tracer rd and it’s different shape vs XM193 or 55FMJ bullet.
So if I use a standard 55FMJ in 223 case. Why Couldn’t you use 556 load data?