...I've heard discussion claiming the .38 Special brass that was originally sold as ammo with the 148gr hollow base wadcutter bullet is different internally than typical .38 Special brass but I can also say that I don't use any wadcutter specific brass for my S&W Model 52's, all of which are highly capable and extremely accurate pistols.
But I toss that out there anyway as perhaps the .32 Wadcutter brass is different than .32 S&W Long brass. I have a slew of both, and apologies as I have no interest whatsoever in trying to determine if the case capacity is much, if any different...