Haven't loaded the Hornady 150, but I've shot a bunch of the Sierra and Nosler 155's. Buy them by the thousand, which saves over buying 100 at a time.
Just because a bullet has a cannelure, it doesn't mean you have to use it. I seat the 155 to 3.30" and they shoot very well. Good enough to win some trinkets at the annual Rifleman's Weekend M1 match.
A good M1 can shoot 2MOA when properly tuned. The ammo is only a part of the equation.
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