http://www.atf.gov/firearms/faq/faq2.htm#h4 said:(H4) Is a person who reloads ammunition required to be licensed as a manufacturer? [Back]
Yes, if the person engages in the business of selling or distributing reloads for the purpose of livelihood and profit. No, if the person reloads only for personal use.
[18 U.S.C. 922(a) (i) and 923(a), 27 CFR 478.41]
Technically, only if you do so with intention of making money, more or less.