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Yes, this is 243 Winchester. The 243b is just the model number for this product. Hope this helps.

Yes it is standard 243 Winchester. "Caliber 243 Win Bullet Weight 100 Muzzle Velocity 2960 Bullet Style Jacketed Soft Point Ballistic Coefficient .355 Bullet Length In 1.006in. / 25.55mm Package Quantity 20 Usage Medium Game" Full specs here https://www.federalpremium.com/rifle/power-shok/power-shok-rifle/11-243B.html

Edgar, this is regular 243 Winchester. Buds just added the B for Box (of 20rds). 20 Rounds per box, 200rd per case. To buy a full case, order 10 boxes.Cheers and stay safe!