I got to shoot my Glock 29 10MM with the 357 Sig Barrel conversion I bought about a month ago.
First of all, the weapon shot with NOT ONE HICCUP and NO FTF or FTE, even though the 357 Sig rounds were shorter than the 10 MM rounds!!.
Tell ya something, if you were to ever think of a more complete conversion, then this is probably it!! I shot 200 rounds with the drop-in .357 Sig Barrel. NO noticable felt recoil, with using 125 Gr JHP or 147 Gr Ball ammo. I believe this is mainly due to the heavier Glock 29 slide and recoil buffer system. I'm sure that if you converted a G22 or G27, to a .357 Sig, you'd REALLY feel the difference, due to that frame/slide size and weight. I'll post a complete report on Saturday, along with complete pics and my findings.