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The biggest reason why the conicals are not as accurate in modern Italian replicas is probably because of the undersized chambers compared to the groove depth in the Italian guns. Most of the Italian .44s have .450" - .454" groove depth, and have .440"-.445" chambers! The longer, heavier conicals don't obturate that quickly, letting gas get between the bullet and the rifling, throwing accuracy off. The soft balls expand in the bore faster, reducing this problem. Ream your chambers to proper diameter and you will notice an improvement in the accuracy.
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