If you are not real worried about accuracy,the local gun store bullets will work, but if you want to get serious, push a lead ball that is slightly oversized (Maybe like a 45 cal round bal) and measure it. 44-40 can run .425-.429, and sometimes bigger.
Then order some cast bullets from Dardas( Essexvile, MI) that are .002 bigger in diameter than what you measured.
Dardas will size to your specs.
www.dardascastbullets.com He ships the USPS Flat Rate box and shipping for 1000 will run about $11.00
My 38-40 measures .401 and the std 40 cal. bullets would not hold even a 6" group. The.403 bullets I ordered now do about 3" groups.
