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Soooo.. for anyone still bothering to read this far... my question is could I seat the 44 mag bullet all the way out to 1.775" or so for a COAL? That would give me an extra 0.200" of "extra" cartridge capacity. Not as much as a true 445 SuperMag, but it's still more than the difference in length between a 38 and a 357 or the difference between a 480 Ruger vs a 475 Linebaugh.
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This is what Buffalo Bore and Garrett do with their 330gr and heavier cartridges.
You just plain-out can't fit them in the cylinder of a S&W 29 or 629 though. Too long.
I've played this game with 300gr bullets, H110 and my 5.5" Redhawk though. Great big long cylinder on that one, and I made cartridges that dang near felt like they were coming from my friend's .454 Freedom Arms.
The problem you run into is making certain you have a good enough crimp that during the recoil of one shot, you're not rattling the bullets loose on the rest of the cylinder. I've had some bullets jump crimp in the past playing this game.
.44 mag has a lot of "undocumented" upper threshold, but it stays undocumented for a pretty good reason: The Model 29 and 629 just weren't made for it.