No, Italian shot is not the same. Their #7 is essentially the same but, the #6 and #5 and #4 are just slightly smaller than US sizes. Example: their #6 run 241 to the ounce versus US 225 to the ounce. Nominal and variable of course but I have found their numbers to be correct. Go to the B&P USA website and click on Product Info, Reference Materials and then Cartridge Guide. On the left is a comparison of US vs Italian shot sizes.