Crimp doesn't hold the bullet: case neck tension is responsible for that specific function.
In 45ACP recommend obtaining a ($20) LEE "U" undersized Carbide sizing die. This will resize your cases to a slightly smaller diameter that will hold the bullets firmly. Then crimp the mouth to .470-.472".
Make sure you bell the case mouth enough to allow fairly easy bullet seating; too little flare will deform most bullet bases when seating, affecting accuracy (bullet base 'steers').
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"all my ammo is mostly retired factory ammo"
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