38 super starting loads

[captn-tin]

Finally getn rnd to experimenting with some 158 gr swc cast boolits in my 38 super. Using 4.1 grains of universal for max (lee manual) for 906 fps, I'm cutting that by 10% to start with, then 5%, then maybe 3.5% then 3%. Sound bout right? These boolits were .358 and I sized them to .357. I'm going to "ladder" these loads. Should I start with 3 of the load, 5 or? Planning on sighting in at 25 yds from a rest. Again, sound bout right? Thanks for any help.

[Tom-ADC]

Back when I still had my 38 Super I really liked Blue Dot but used jacked bullets, but for cast I liked Unique. Not much help.

[sofbak]

The difference between -3, -3-1/2, and -5% is going to be very small, tedious to measure, and probably insignificant in measurable performance. IIWM I'd go 0.2 gr increments like 3.6, 3.8, and 4.0 and maybe 4.1.

[idahodick]

Is the case fully supported

I have a sig 220 in 38 super, the case is fully supported, it will handle 8.5gr of bluedot under a 158 cast bullet. Use very hard cast bullets or you will get leading. crono at 1212. I also have a commander in 38 super, does not support the case fully, At 7.6 gr of blue dot the cases start to bulge.

[sigguy552]

I have a Dillon 38 super case gauge for $10 shipped if you're interested. Also have a set of brand new Lee carbide dies for 38 super/acp for $30 shipped.