I've used the same charge of 2400 under a 200grn Hornady XTP in my Model 21 (went with a lighter bullet just to be on the safe side. No signs of excess pressure but both recoil and fireball were impressive to say the least. As far as reasons to hot rod the Special, my M21 weighs 37oz empty. That's quite a bit lighter than a M29 but is still a steel N-Frame capable of handling heavy loads. Truthfully though, I much prefer the Skeeter Skelton load (250grn LSWC @ ~950fps) as it's much more pleasant to shoot.
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