Quote:
Originally Posted by hdwhit
Although I have had to use various powders over the years based on availability, my predominate load is 20.3 grains of IMR-4198 under a Hoernday 60 grain soft point or hollow point bullet producing a velocity out of 16 inch barrel of around 2800 fps. Based on Hornady Manual #4 and Hodgdon Manual #25, this should produce a chamber pressure below the 52,000 psi SAAMI max. for .223 Remington.
So, I guess my answer would be that I use .223 Remington in my AR.
ALSO PLEASE NOTE the manuals I rely upon for the load specified above were printed in the 1980's and later editions have LOWER maximum loads. Always load using data from current published reloading manuals.
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If you get a chance, you might want to run that load over a chronograph. Based on my experience with that powder, I would be surprised if it is much over 2600 fps out of a 16" barrel. Hornady 8th edition shows 19.1 gr as max, for 2900 fps, but that is out of a 26" barrel. I never had much luck with 4198 in the .223 for accuracy or velocity. YMMV.