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The amount of compatible base weapons is only meant to be used to get an idea of how common ammunition of this caliber is. It does not take in account cross-caliber compatibility (e.g. .38 Special can be loaded and fired in .357 Magnum revolvers) or rare calibers (see below).
''Rare calibers'': The calibers referred to informally as called ''rare calibers'' are those listed as having zero compatible weapons. Such calibers are not unusable; it simply means that there are no unmodified weapons chambered in this caliber, and that an existing weapon '''must''' be modified to be able to shoot such ammunition.
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