5.7mm Johnson. 40/45 grain .223/.224 bullet at nearly 3,000 fps from about 11.5 grains of IMR 4227.
H hdwhit Member Joined Nov 16, 2015 Messages 5,159 Location Salem, AR Feb 28, 2021 #51 5.7mm Johnson. 40/45 grain .223/.224 bullet at nearly 3,000 fps from about 11.5 grains of IMR 4227.