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Anything that will alter the chamber bores of a cylinder, especially opening them to a larger diameter, shouldn't be done. The cylinder is designed to withstand a certain set pressure, and if the chamber wall thickness is thinned, that pressure rating drops. The only way to do it would be to make a larger cylinder, but it wouldn't fit in the frame. Then, even if the chambers weren't altered, a hotter load would exceed that set safe pressure. This all is why the manufacturers have different frame sizes.
The barrel is next, and is designed towards the rear for the pressure it will see when the bullet passes into it. If it is exceeded, it can rupture, or actually be blown out of the frame.
Last, is the added stress to the top strap, which could cause it to crack.
The only way to safely do it, would be to use a revolver that is designed for a greater load than you want, and downsize it.
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