I shoot the 55's out of my 20 Extreme with a 25", eight twist barrel and they do pretty good. MOA at 400 yards at about 3175 - 3200 if I remember right. Was shooting gophers this past summer at 250 ish yards with them. I know I didn't need the big ones for that but they were loaded up so they were used. My fast twist doesn't shoot anything under 40 grain, they keyhole or just don't get there
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