That is almost a perfect duplication velocity and pressure wise. I've been using that load since '75 myself with the Hornady and Speer swaged LSWCHPs. That load over a soft cast 358477 is also very good. I also use 5.5 gr under a very soft cast (40-1 alloy) 358156 and HP them with the 1/8" Forster HP tool and then further open the HP with a countersink. I was able to buy my issue 5" M15 when the department switched to 4" M15s. Any of those loads are about the most effective 38 SPL loads I've used.
Larry Gibson