Unless the other (non-Federal) primers seat deeper, an extended hammer nose won't do the job. The only thing the C&S hammer nose will do is reach out further, but if the mainspring is too light or the hammer too light, or headspace excessive, it won't help.
Usually "butchering" of an S&W revolver takes the form of "doing a trigger job", so Lazy D's advice is pretty good.
Jim
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