Congratulations on your new Rock, looking forward to reading your range reports. I'm expecting to take delivery on a longslide tactical 1911 by summer time.
Currently I have a G20 and G20 SF, both with aftermarket Lonewolf barrels, plus there's a 6" KKM barrel if I want to push WFNs. Pushing JHPs to full 10mm velocities can be a big mistake, especially if the primary purpose is personal defense at personal defense distances.
Since the use of Underwood ammunition has been mentioned as a suggestion, I visited their website to learn more about their ammunition selection for the 10mm.
I'm dismayed by their Gold Dot selection because the 155/165gr bullets are being pushed too fast than the bullets were designed for.
http://www.underwoodammo.com/10mmauto165graingolddotjacketedhollowpointboxof50.aspx
This what a 165gr Gold Dot's expansion should look like, 1.5 times the caliber with an advertised MV of 1150fps (#53970);
While this recovered GD was fired through a 40S&W carbine ~1500fps, three recovered 165gr Gold Dots shared the sheared off shape fired from a 1911/400 Corbon, <1400fps;
The first customer review at the above Underwood link wrote highly about the wide expansion of a Gold Dot bullet, this 155gr GD (~1435fps) over expanded in a similar manner and is good for about 8" of soft tissue penetration;
By comparison, a 357mag, 158gr, traditional Winchester JHP lead exposed design at 1437fps expanded 1.45x caliber and is good for ~19.5" of soft tissue penetration;
What Underwood has failed to address for the consumer is that Speer engineers have designed their JHPs high velocity limit to 1300fps. Their advertised 155/1500fps and 165/1400fps Gold Dots far exceed their designed velocities, resulting in very diminished bullet performance. By contrast, the old school 357/158gr JHP was designed for magnum velocities some decades ago and still performs at magnum velocities today.
Speer does make shallow cavity Gold Dots that perform at elevated velocities. By increasing/decreasing the surface area within the JHP's hollow cavity, engineers design the velocity window sweet spot for each JHP. Magnum and 357SIG Gold Dots have shallow cavities while slower velocity calibers have deeper (increased surface area) cavities.
This is where Underwood has made another fundamental mistake in their product offerings, and this time it's with the 38 Super. Underwood loads the Super with 124gr Gold Dots, and XTPs, to 1350fps. Speer on the other hand uses the shallow cavity 125gr Gold Dot at 1335-1370fp for the 357SIG.
Again we can see a dramatic difference when the wrong bullet is used at the wrong velocity design. Like the 155gr Gold Dot pictured above, this is what a 124gr Gold Dot looks when it's pushed to fast;
For comparison, 38 Super/125gr Gold Dot @1436fps, ~15.6" soft tissue penetration;
For me, the 10mm comes into its own as a trail or a hunting caliber. Reduce velocities when carrying JHPs, 180s perform very reliably in the mid 1200s giving good penetration and crush cavities. For busting up bones and very deep penetration it's hard to beat the heavy WFNs at whatever velocities one wants to push them.