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I have never shot a lot of rounds through my Mod. 29 but back in the 70s when I was reloading, I was in my 20s and on an ego trip, I had a Mod. 58 and I used to load as hot as the books would let me. I don't know how many hot loads I ran through it but it was a bunch and it's still going strong , the guy I sold it to still shoots it and he says it's still tight. That's the only N frame I ever shot that much though.

When you say S&W don't handle heavy loads as well I assume you mean J and K frames. I don't think anything would handle them better than a L of N frame, especially Ns.