The "WIN" NT Brass was the first small primer brass in 45acp. It is designed for indoor range use and all components are Non Toxic thus the NT designation. Supposedly the manufacturers say they must use small primers to produce the non toxic ammo, I think it's a cost saving measure.
The Federal 45acp ammo sold by WalleyWorld is small primer and Speere and several other manufacturers have followed suite with small primer 45acp..
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