4053
Just recently converted a 4053 to 10mm. I was able to find/purchase an unused 40S&W barrel and slide to use for the conversion.
The 10mm slide and barrel uses the "nested" double recoil spring and is fitted with the OEM inner spring and a 21lb outer spring. (short action/bbl Wolff recoil spring #47721)
Along with the re-chambering, additional changes included switching to a slightly shorter ejector lever, and removing the spacer from the magazines. Also purchased a couple of S&W 9 round single stack 10mm mags, which work fine after the tab is removed.....although they extend out of the frame a bit.
The only problem for me has been the recoil spring arrangement...the gun is a bear to get open! (for a geezer) Recoil with 180gr practice ammo seems about the same as the 40 and is very manageable.
Haven't shot it with "duty" ammo, but I suspect that the recoil spring might have to be slightly heavier if heavier loads are used. With the spring arrangement listed above, shooting the 180gr practice ammo (1100fps) the slide just barely makes it to the slide lock on the last round.