The earlier Model 25's and some early 625's will handle .45 ACP's with out the clips (headspacing on the mouth of the case).
Smith made a decision on the later 625's to NOT follow the original protocol and the later units REQUIRE moon clips for proper headspacing.
My 625-6 and 625-8 revolvers require the clips (or the use of .45 Auto Rim cases).
Dale53
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