Hi there,
I am new to the forums here. Forgive me if I am posting this in the wrong section. I have recently started casting my own boolits for 9mm. The mold I elected to use is a lee 356-125-2R, 2 cavity mold. I am finding that these molds drop to .356 and I am double powder coating using the shake and bake method with harbor freight red and white bb's, and then sizing after baking with the lee .357 sizer, which when measured is more like.3565. My loads that I have been testing is 3.8gr - 3.3 gr of titegroup with an OAL of 1.125, and cci primers. I have had a chance to use a chronograph, and 3.8gr of titegroup is giving me a FPS of about 1028.I have been testing in a gen 3 glock 34 with a kkm drop in barrel, and a cz 75-sp01 stock. My issue and what is confusing me is that I am encountering leading and occasional bullet tumbling. When I have done a similar load with a Missouri bullets lubed 125gr .356 bullet I get no leading and it is accurate. Now before anyone asks, I have not had the opportunity to slug the barrel, I did attempt but made the mistake of using a wood dowel, so I haven't revisited that. My lead source is range scrap lead, that I am fluxing but not adding anything else to it. I am wondering if I need to try a different bullet mold, or If I need to try to resize to .358. What confuses me is the bullets I bought are sized to .356 and seem fine, but the ones I have cast and powder coated, tumble, lead the barrel, and accuracy is questionable. Any assistance would be greatly appreciated. I will continue to scower the threads in hopes of trying to figure this out.