I-Run Guns is another Importer that can get ammunition into the U.S. from Canada.

https://irunguns.ca/content.php?page=import-process-canada-to-us

There are several ATF Field Offices located in Alabama, and there are regulations concerning importing ammunition on the ATF website. Under the instructions for ATF Form 6, there are some rules concerning the import of ammunition for personal use that seem to suggest you may not even need the services of an importer. See No.'s 3 and 7 under the General Information section of the Instruction Sheet for ATF Form 6

According to No. 7, you may not even need an FFL to import ammunition for personal use and not for resale. If that is true, it could save you a few bucks.

https://www.atf.gov/media/22521/download

It might be worthwhile to give an ATF office a call, or pay them a visit rather than seeking info from internet lawyers.