Don't be surprised if you don't get a response from Barnes. I ouldn't get one for my 10mm using their 155 gr. bullets. I got a really detailed one from Ramshot, however. So, perhaps you can try Alliant if I recall correctly that they make Unique.
I, for one, would be very reluctant to try "working up" a load for the .45 ACP in a handgun. Handguns don't show pressure signs nearly as well as do rifles. When dealing with a round like the .45 ACP, which tops out at pressures in the low 20,000 psi range, I wouldn't try it. Especially with a bullet like that. BTW, whatever you do, be very careful overall lenth of your loads.
I'm in the same boat you are. Have to go lead free in the next few years for hunting. E
