Hi Garry,
Are you looking for a 44-77 bottle neck or 44-90 bottle neck cartridge? Both were popular Sharps calibers. I have some 44-77 ammo with case length of 2 1/4" and the overall length is length with the bullet is 2 7/8".
Sounds like you have the 44-90.
I would look at Buffalo Arms(they are out of stock, but I would reach out and see when more might be available, a good company to know about anyway):
https://www.buffaloarms.com/
Rocky Mountain Cartridge can make brass:
https://www.rockymountaincartridge.com/
Happy to help if I can!
Good luck,
Jay