Read your books. Then do yourself a big favor and speak with Bryan or Lanny at LA Gun in BR. That really would be worth your drive. You would be able to get real time help when some thing goes side ways, and it will. You are going to have pride in your own production. Have fun!
Indirect Aiming for Bowhunting by Bob Wesley.
Video and pamphlet
Former World Traditional Longbow Champion
I do not know if he is still alive, but he used to live in Poplarville, MS.
His method will help you relax, not panic, and send arrows repeatedly to the same place.
With that many powder mummies are you sure that you are using the right powder for the aplication? Maybe get some advice on that from someone more experienced.
Take a soft lead slug, like a fishing weight and tap it thru the barrel from the front without the cage and a separate slug thru the cage. Put your calipers on the slugs and compare to your non-fired Boolits. An egg fishing weight will work. Drive them thru with a jag on the end of your rod...
Slug your barrel and bird cage. Compare dia to the swaged dia of unfired projectile. Sounds mismatched. BB may be able to supply a different swaged size to fit your equipment. Or buy unswaged boolets and run thru a Lee push thru swage tool. Also confirm powder load data.
Go visit with Bryan at LA Gun and then buy your Dillon stuff from him. He will be a tremendous help when you set up and have some question in the future. Buy local, get local help.
Just be sure to get one of the above. If they are from out of state they can get the Wild LA stamp. BE SURE to sign in and out, no fee, but a big fine if you do not sign in. The Rangers have checked a few times in my experience. Rifle range, Pistol range, archery tower, clay pigeon range that...
Not as easy as more open chokes, but use what you plan to hunt with now and again anyway. You bust them with that and you Know that you will bring home the bacon later. All fun.
Some brands of skeet will dissolve away after some time. They make great reactive targets, especially for kids or adults new to the sport. If they were the kind made with tar then they aren't going away.
Beauxdog is steering you straight. Get what you can get now so you can start making smoke. You can get "best for you" as other stuff becomes available. Getting something that can be used in several things will give you some extra flexibility. Get what you can get and then starting to use up...