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In page Rifle:
"Some of the earliest examples of European grooved gun barrels were reportedly manufactured during 1440, and further developed by Gaspard Kollner of Vienna c. 1498, although other scholars allege they were a joint effort between Kollner and Augustus Kotter of Nuremberg c. 1520.[4][5] Military commanders preferred smoothbore weapons for infantry use because rifles were much more prone to problems due to powder fouling the barrel and because they took longer to reload and fire than muskets.[citation needed]
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