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Are the other available bullet molds significantly better?
So, it seems there is more to this than what the primer has to offer on the surface. For the life of me I cannot sit here and tell you what I have done either correctly or incorrectly. I do not know anyone else that loads BP cartridge. Heck, I am the most experienced smokeless cartridge handloader I know.
There are several better moulds than Lee, who is the 'low price leader' for a reason. Generally, the more you pay the better you get with moulds. But, depending on what you are trying to accomplish, Lee may be fine. Lee, Lyman, RCBS, Saeco, BACo and then custom by Brooks, Hoch, Jones and others is a reasonable bottom-to-top rule-of-thumb.
Have you slugged your barrel? If not, then your bullet could be either too large or too small. If too large, then you can often size to the correct dimension. If too small, then you are generally in need of another mould/bullet.
If you were shooting brass for the first time, you may find that your fire-formed brass gives better results the second and subsequent times out.
Can you tell us what 'custom' means in relation to your TD? Lined or after-market barrel, etc.
What mix of lead are you casting with? As mentioned above, you may using too soft a mix and the bullet is not holding its shape.
Where do you live? You may be close to someone who would be more then happy to help get you rolling with BP. However, think you are well on your way and asking questions here is a good place for additional info.