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    M25 vs M62 Tracer?

    What is the difference between M25 and M62 tracers? The only differences I can see are: 1. M25 weighs ~2 grains more 2. M25 has 2 cannelures vs 1 on the M62 Otherwise are these functionally the same? Or is there a difference in vintage, tracing compound, etc.? Other information I would like...