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Leo, yes Sir. They are loaded to 5.56 pressure which is what the Sig Sauer M400 rifle is rated for as well as .223. Cheers and stay safe!

Yes, "Australian Munitions' 5.56 mm F1 ball ammunition employs a specifically designed single base propellant with very low temperature coefficient of ballistics to ensure velocities and pressures remain consistent within variations in ammunition temperature.The propellant has extreme clean burning characteristics and is an excellent replacement for those propellants that exhibit weapon fouling." These will also function with no problems in an AR15 like your sig