Winchester Ammo WSC220SU Unprimed Cases 220Swift Rifle Brass 100/Bag
https://www.tandktactical.com/shop/020892631823-winchester-ammo-wsc220su-unprimed-cases-220swift-rifle-brass-100-bag-10114
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Winchester shellcases for rifles are engineered to precise tolerances to ensure smooth-feeding and positive chambering.
