Would someone have factory-made .38 Special Super Police cartridges at hand? Any chance to check their overall length? I'd be interested in replicating this load but when seating Lyman #358430 boolits in such a manner the front driving band is sticking out of the case mouth a bit - something like what the original looks like - the cartridge is possibly becoming a bit shorter than the original. It seems to me that Lyman makes the subcaliber ogive a bit shorter than the original is. This is all based on eyeballing though, I don't have a vintage one to measure. I suppose those were soft lead swaged boolits? Is there any picture of their structure out there?
Here's my Lyman compared to original Super Police cartridge made by Western.