You're welcome.
There's a way to achieve absolute certainty about whether your bullet is a .54 "Georgia Teat-Base" or not, if you care enough about its ID to do additional effort and expense. Your bullet has been fired, and the gunbarrel's rifling-grooves changed the shape of your bullet's body-grooves. Because I had only your photos, without any measurements, all I could do is make my best "logical" guess based on the photos. But you can examine it in real-life. Go to the following webpage which shows an unfired .54 "Georgia Teat-Base" bullet, and carefully compare your bullet with the sideview and baseview photos:
19th Century Bullet Collection - Tom Henrique
That webpage also gives the bullet's precisely-measured length and weight in Grains (not Grams). You'll need to borrow or buy (costs about $15) a Jeweler's Scale for weighing your bullet in Grains. According to the M&M book and T&T book, a "Georgia Teat-Base" bullet weighs 435 to 450 grains.
Also according to those books, the length should be 1.02 to 1.08 inches.
The gunbarrel's rifling-grooves changed your bullet's diameter... therefore, it won't match up with the diameter of an unfired one.
By the way, I see you live in Virginia. I'll have a sales-table at the North/South Trader magazine's National Civil War relic show in Richmond on July 19 & 20. If you are coming to that show, bring your bullet so I can measure it with my digital caliper and weigh it on my Jeweler's Scale. Ask the show's staff for the location of Pete George's table, and introduce yourself. My table is usually very close to Steve Sylvia's table.