Here' s a pretty good list of ammunition manufacturers, i.e., their websites:
Ammo Bank
Catalog of ammunition and accessories.
www.ammobank.com
Ammo Direct
Offers ammunition and shooting supplies for handguns and rifles.
www.ammodirect.com
Ammo-R-Us
Offers brass cases, bullets, and reloading kits and presses.
www.ammorus.com
Ammunitionstore.com
Offering ammunition, reloading supplies, magazines, and more.
www.ammunitionstore.com
Berger Bullets, Ltd.
Handmade custom bullets for the competition shooter.
www.bergerbullets.com
Beta Company, The
Offers the C-MAG high capacity magazine for military and law enforcement weapons.
www.betaco.com
Black Hills Ammunition
American made ammunition.
www.black-hills.com
C Products
Aftermarket firearm supplier and manufacturer of AR and other related gun products. C Products offers 20 and 30 round magazines and replacement kits as well as springs and other replacement parts for the AR15, M16, and M4 models.
www.cproductsllc.com
Cascade Ammunition
Offers mail-order ammunition and other shooting supplies.
www.cascade-ammo.com
Centurion Ordnance, Inc.
Markets and distributes Aguila ammunition.
www.aguilaammo.com
Cheek, Ronnie
Offers 6mm bench rest rifle bullets.
www.cheekbullets.com
Conley Precision Cartridge Co.
Offers handgun and rifle ammunition. Custom cartridges available.
www.cpcartridge.com
Cor-bon
High performance ammunition for self defense and law enforcement.
www.cor-bon.com
Corbin Manufacturing & Supply Inc.
Makes swaging equipment for bullet manufacturers.
www.corbins.com
Custom Cast Bullets and Reloads
Firearm brass, bullets, reloading, swaging, casting equipment, and dies.
www.customreloads.com
Federal Cartridge Company
Hunting and shooting information, ammunition catalog with updates, ballistic data, downloadable shooting game, and more.
www.federalcartridge.com
Georgia Arms, Inc.
Ammerican made ammunition.
www.georgia-arms.com
Hawk International, Inc.
Makers of the Super Hawk wad for 12 gauge shotgun shell reloading.
www.hawkinternational.com
Hornady
Manufactures sporting and hunting bullets.
www.hornady.com
Huntington Reloading Accessories
Distributors of standard and hard-to-find reloading products.
www.huntingtons.com
Israel Military Industries
Producer of small arms ammunition.
www.imisammo.co.il
MagLoader
Loader for .32 through .45 ACP pistols in both single and double stack magazines.
www.magloader.com
Mid-Kansas Cast Bullet, Inc.
Commercial and custom cast lead bullets.
www.mkcb.com
National Bullet Co.
www.nationalbullet.com
No Excuses
Offers bullets for muzzleloaders.
members.aol.com/noexcusesb/index.html
Old Western Scrounger Inc
Source of obsolete and metric ammunition and brass bullets and primers.
www.ows-ammo.com
PCM Ammunition
Provides guns and accessories.
www.pmcammo.com
Professional Shooters Products Inc.
Cast bullet company that specializes in gas checked rifle and pistol bullets.
www.ProShootPro.com
Proload Ammunition, Inc
Manufacturer of premium handgun ammunition for target, hunting, or personal defense.
www.proload.com
Rainier Ballistics
Plated bullet producer.
www.rainierballistics.com
RCBS
Provides reloading presses, scales, dies, and supplies.
www.rcbs.com
Remanufactured Ammunition
Sells remanufactured pistol ammunition.
www.remanufacturedammunition.com
RTG Ammunition
Antique and obsolete ammunition for collectors to purchase or sell.
www.rtgammo.com
Safariarms.com
Offers custom loading of precision hunting ammunition.
www.safariarms.com
Trust Eibarres S.A.
Producer of shotgun cartridges for hunting and competition.
www.trust-eibarres.com
UK Gun Products.Com
Offers air gun pellets and an online magazine.
www.ukgunproducts.com
Winchester Ammunition
Offers industrial products and law enforcement information.
www.winchester.com