About half the 38/44 "Heavy Duty" revolvers encountered have been reamed for 357 Magnums.
True- and I'd like to bring up a related topic regarding the .38/44 HD.
Although production numbers were only a small fraction of pre-WWII K frame .38Spl output, the .38/44 HD was, for many years, by far the most numerous N frame. IIRC its production figures outstrip all other prewar commercial N frame models combined (excluding WWI-era military M1917 and .455HE production). Furthermore, much of the factory's output was snapped up by law-enforcement agencies, many of which later converted to the more capable yet lighter .357 Combat Magnum / Model 19. The result by the late 1950s was a relative abundance of low-priced shooter-grade .38/44 HD's on the secondary market.
One result was that the .38/44 HD became fodder for many gunsmith conversions to either emulate the exclusive and expensive N frame .357 Magnum / Model 27, or to fire other cartridges for which factory guns weren't readily available. Although I
don't recommend trying it today, .38/44's are generally strong enough to withstand firing at least
some .357 Magnum ammo once the chambers are lengthened to allow the longer cartridge to fit.
Another result was that demand for new .38/44's fell off the proverbial cliff, as stated above.
The final result is that unmolested original .38/44 HD's have become quite collectible over the last few years, including so-called shooter-grade or even "beater-grade" guns. The primary reason is that many original ones had the barrels cut, different sights installed, chambers lengthened, etc. by Joe Gunsmith ca. 1965.