Well I have acquired a copy of the RCBS 38-150-SWC, which correlates to the lee 358-140-swc in that the amount of bullet below the crimp groove is almost identicle. I've worked loads up (for the Lee 358-140-SWC) using the RCBS data going all the way to 18.0 grains of 296 (which is over the RCBS data but with a lighter bullet so use at your own risk). Nothing spectacular accuracy wise, 2.5" at 25 yards but I'm still working with it.