Mushroom-shaped inserts brown and black were born for Steel-shoot. Mushroom-shaped insert zinc was born for Lead-shoot. We have made many tests. We have found best precision with Mushroom-shaped inserts black up Lead-shot from n° 3 to n° 6, with Mushroom-shaped inserts brown up Lead-shot from n° 7 to n° 9-1/2 and with Mushroom-shaped inserts zinc up Lead-shot from n° 10 to n° 13

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