A 1:12 twist is good for lobing heavy rounds too. I can get my SP1 sporter to launch 75gr sierras BTHP with 25.2gr of 748 (super hot load fyi) with a 1.75MOA at its best with my eyes. Remember your building M16A1 not a DMR so a 1:12 is perfect for your needs. But VooDoo tactical had some in their catalog last time I checked with a 1:8 or it was 1:9.
Last edited by ClassIIIGunsmith; 01-07-16 at 12:25.
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