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"an XD40 can shoot a 357Sig round, but with a different barrel.
can you then get a 10mm Barrel & Mag and shoot 10mm with it?"

I know not about the XDs, but with the Glocks, you can get aftermarket barrels to make the 10mms shoot .40, but not the other way around. 10mm frames/slides need more "beef".

"it is evident when you hold the Glock 29 (10mm subcompact) next to the Glock 27 that the 29 is built for higher pressures."

Yep, that extra required "bulk" methinks is another the reason the fibbies liked the thought of the .40 "short and weak", as it would work with the same size frames as existing 9mms. Notice Glock makes 3 standard sizes in 9 and 40, even 357 Sig - but did not even bother to make "the baby" size in 10mm.

I immediately went to the pinky extensions on the 29 magazines. For me, just not enough there to get a comfortable grip for controlled rapid fire without 'em.

Doug - IIRC, the 10mm pistols were not even widely distributed within the ranks of the fibbies. Some of the initial testers (I think - from old reading elsewhere) made the determination the recoil might be a little much (for more than just some ladies). The "MP-5" is a 9mm sub-gun. I think their 10mm version has a slightly different designation.

True. IIRC, around 1400 in inventory. And guess who pays for the ammo?

I had the opportunity to shoot one several years ago and they are sweet - very accurate and surprisingly low recoil for what it puts downrange.

I sent 29 slide to Bar-Sto for .40 barrel to be able to shoot somewhat cheaper ammo. FWIW, some chron results:

10mm Double Tap loads out of stock Glock 29 barrel.

135 grain JHP: 1,481 fps

165 grain Gold Dot: 1,302 fps

180 grain Golden Sabre: 1,247 fps

200 grain XTP: 1,137 fps

220 grain cast: 1,028 fps

LW 5-4-05 S&W 340 Win. White Box .38+P 125 grain JHP 809 fps, Speer Gold Dot 125: 785 fps

5-4-05 .40 180g hand loads; Sig 229: 934 fps Glock 29 w/Bar-Sto .40: 956 fps

5-4-05 Speer Gold Dot 165 grain: Sig 229: 1,116 fps Glock 29 with .40 Bar-Sto: 1,142 fps

5-4-05 Glock 29, Double Tap 165 grain Gold Dots: 1,279 fps (only 137 fps more than .40s above)