A difference of 743 to 75 is within tolerances. You'll notice no differences in bullet performance or handle-pull on the loader. The crimp may be a little deeper on the longer cases (depending on the type of crimp you use), but it shouldn't affect performance, unless you're loading match grade.
Although I usually don't crimp, that's why I always trim my casings. I see it as just one of the steps of loading, instead of something I only do occasionally.
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Right turn, Clyde.
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