There are several commercial casters who offer LBT bullet designs, though I'm not aware of any at present who I would recommend.
Keep in mind that my reason for not recommmending any at present is the poor quality of the one known commercial caster. If there are any who hand cast LBT designs and will let me know who they are I'll recommend them.
If I were to recommend casters who I know supply poor quality, the user will not get a fair test of LBT performance. This is not to knock commercial casters as a whole, but they work extremely hard for their small profit, and tend to sell pounds of lead rather than quality.
You state that you are not a great pistol shot. -- Most people would be amazed at how good they will become once they obtain an LBT mold and set their handgun up for it. When bullets all fly to the same point relative to the sights, we quickly learn what we are doing wrong and correct it automatically, without tutoring. If the gun buckshots a 2, 3 inch or larger pattern at 25 yards, who can tell if he has pulled his shot or the gun threw it wild.
I wasn't a good handgun shooter until I taught my guns to cut a ragged hole, then I quickly learned to hit a four inch target at 100 yards with a two hand hold, standing. Not exactly every shot, be sure you understand, but close enough that no coyote or deer gets away.