I've loaded plenty of 148gr. wadcutters upside down. Expansion is quite impressive. Loaded them with the same powder charge as right side up. Very good for short range work.
Speed reloads may be a chore with that profile...
Someone had to say it.... Has anyone actually TRIED speedloading with wadcutter profile rounds? It's difficult unless you are REALLY deliberate...
This is a step back in concept to me. Who cares about "dead air" in the case? Other manufacturers have been loading SD .38 ammo without worrying about the case capacity having open air. You can't go too high in pressure without fragging someone's Airweight lockwork, so what's the point in compressing it?
We have enough trouble trying to get GOOD .38 snub ammo without some hang up (bullet design can't expand at the velo snubbys have, profile makes it hard to reload quickly, expensive or unobtanium during a run on ammo like the short barrel Gold Dots)...