Interesting feedback. You "may" have hit on something with your technique and unorthodox load(as opposed to the norm).Always interested in others ideas, can always learn something.
Normally don't get the consistent boolits with "cast" products, so your friend's product must be good quality control and consistency.
1:8 twist bbl not common here at all. Of course Apex not available here any longer that I am aware of. 1:14 or 1:12 being the desired twist for the 148 grain wads. Swaged of course. The only decent cast .38 boolit I ever got good results from was from an old vintage H&G 6 cavity 148 wadcutter mold that was well seasoned and broke in. Used linotype and wheel weights combined and alox lube that gave me very consistent rounds. Don't cast anymore. Had to kick up the load to get any decent grouping with it.
Right now the most accurate boolit has been the Remington 148 grain wadcutter, that for some reason or another dried up. Never fails.
Surprised you don't have any reload hang-up's with the boolit down in the case, with no lead in or roll crimp to keep from possibly hanging up on the cyl edge.
Here is my contact in case you want to e mail me or need any help with holsters
Again thanks for feedback.