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Uniform case neck tension is a big factor for accuracy. For my 223 match grade ammo I use Winchester brass. Winchester brass will shrink my groups to about half the size compared to LC brass. With 77 smks my 20-in barrel service rifle will shoot quarter minute groups. I length check my cases and only trim them when they are too long. I think the largest factor for accuracy is bullet selection. Not just the bullet weight but the bullet manufacturer. I am getting my best results with Sierra match Kings.