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As Vladymere said, slug your bore but also slug the rifles throat.
Many times a cast bullet that fits the throat will shoot better than one that is .001/.002" over bore diameter (as long as it fits in the fired case).
Also check the rate of twist, it may be too slow to stabilize the longer bullet at the low velocity.

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This is true. many cast bullet BR shooters now size to the throat size (taper and all) and ignore the groove to groove measurement.

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Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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