Realistically... The stock answer is: ZIP. Because you'll shoot more. When I was shooting 4-500 rounds of .45 weekly, Factory went for around $17-18 a box of 50. I figured I could load a box of 50 for about $5. I cast and sized my own bullets, and put no value on my time. Then, of course, there's always the danger of reloading becoming less a means to an end than an end in itself, and THAT can get real pricy.
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Shoot carefully... swifter...