>Mixing binary components together constitutes manufacturing explosives. Persons manufacturing explosives for their own personal, non-business use only (e.g., personal target practice) are not required to have a Federal explosives license or permit.

i.e "the kind of explosives most non-experts in non-military settings are best served by are free to use for personal use (state law notwithstanding)"

https://www.atf.gov/explosives/binary-explosives