Necessary? Depends how low you go. I ran my 625 down to 5.5-6lbs with a factory pin and federal primers. It lit Winchesters with a straight JM spring swap which was around 7lbs.
Now I originally had one of the evil 0.486" pins, I replaced that with a factory 0.495" pin. Take the pin out and measure, if its short order up a new factory for like $4 or $5, all mine were the long ones.
Not a big fan of aftermarket pins, C&S says no dry firing without snap caps or they may break. You can look up C&S extended pins and find stories. I dry fire with crazy and don't want to mess with having to get snap caps.
I do have an APEX in one gun, it has held up, but at my trigger weight I don't think it makes much of a difference. With federals I get 100% with both, with Winchesters its around 80% with both for a 5.5-6lb trigger. I'm sure If I went lower I'd probably notice a difference.
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