That's not hard at all to believe, Rob - a few years back I was playing with (Tennessee Valley Bullets - I'd been using Rainiers and Berry's swaged/plated bullets until a friend in Arkansas told me about the amazing results he was getting with TVBs) hardcast DEWCs for defensive loads and I found that velocity was easily attained (and exceeded) with presently published Unique loads. A quite accurate loading, too. The potential legal ramifications of carrying handloads aside (which of course would not be an issue with the Buffalo Bore loadings), the only real downside that I can see to using it is that it's difficult to do a speedy reload with due to the short nose.
The one on the right:
Here are the results from the first range session I did with the load in question (these velocities were on the high end - averages from snubs tend to be about 75 fps lower):
Remember, folks, this is supposedly a standard pressure .38 Spl load per the Speer # 12 . . . 
Max Unique load from Speer #12/TVB 148-gr hardcast DEWC
M 15 4" - M 1127/ES 19.88/SD 8.54
M 36-1 3" - M 1095/ES 49.10/sd 21.42
M 38-2 1 7/8" - M 1020/ES 75.92/SD 37.92
The load was actually unpleasant to shoot from the Airweight. It was fine to shoot from the other two guns, though I knew I'd launched something of consequence. These somewhat frightening results got me questioning my chronograph, so I immediately shot two 9x19 loads that I'd chrono'd the month before from the Sigma - and they both performed extremely similarly (both were a little faster - maybe the air was fast today) to the way they had last month, which made me think the chronograph was fine.
The two lower groups in this pic:
A later session:
Here are results from a later re-chronographing - these are more in line with the usual results:
TVB 148-gr DEWCs through the 1 7/8" 38-2; same range - 5950' > sea level, 36° F this time:
average of 954.8 fps, ES 36.71, SD 16.82