1) .38 Super is loaded to higher pressure, so I hope you aren't asking about using .38 Super load data
2) If the COL is the same as .38 Spl, the load data is the same. If the COL is shorter, than you are on your own and should at least look at data for a cartridge of the same or shorter length
3) Amazing that since 1908, clips have worked well enough in revolvers that I never heard this complaint. I have heard such about speed loaders, but RN bullets were the general solution.
Since it sounds like a universal complaint, there must be a standard "solution" out there that has already been tried and tested. If not, be sure to share your results with Jerry and the rest.