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www.ramshot.com M. Dave is right, you can use the data for a 158 gr. cast lead bullet with no problems using True Blue which will work excellently for this application, BTW. You do NOT want to use lighter bullet data. The Start Charge for a cast lead 158 will be vigorous enough to use for the cast lead 150. You might want to consider getting a Lyman load manual as well which tends to be the best source for cast lead bullet load data.
Just so you'll know, the cast lead 158 will be designated (L) for lead, LC is for the Laser-Cast brand and the bullet they used was a SWC.