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What the Go To Load for 80gr Sierra SMK .223

Right about 24.0 grains, and run it. That gives around 2725 fps in a standard Service Rifle (20" barrel), but will obviously be higher in a long barrel like yours. That's pretty much "the" standard load for most HP shooters in their 600 yard loads. Normal OAL is about 2.440" in a Wylde chamber, or out to as much as 2.550" in a 5.56mm NATO chamber.

Match the OAL up with your throat, adjust the load accordingly, and you should be good to go.