That's why I buy most of my stuff on line. My house looks like a small gun shot. There are usually three of every possible thing I might need. (Something which my friends have learned all too well) So I always have a spare anything hanging on my gun room wall. The cabinet is stocked with a good supply of different projectiles and there is plenty of powder.
I'd keep the .54 caliber too, and then buy the .50 caliber on top of it.

You can never never have too many rifles in my book.