The reason reloading books say to "Only use the exact components" is that they can't (who can blame them) take liability for stacking tolerances in unknown components. Larger bullets, tight barrels, difference in internal volume of cases, variations between guns, etc.

It's already been said here to start low and work up. If the diameter, weight and materials are the same, with considerations for bullet hardness and profile, I haven't had any trouble with similar components.

The Lyman manual is more forgiving of choice of components.

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