Ordered a few tins of .177 (9.1gr) and .22 (15.9gr) to try out because the price was right. Well... they're all over the place. The first thing I noticed was the were pretty loose when inserting them into the barrel so I decided to put my Pelletgages to work. The .22 pellets were all 5.48mm (possibly less but thats the lowest on the tool) and the .177s all fell within 4.48mm and 4.49mm. Way on the smaller side. The pellets themselves are pretty cleanly made for the most part it seems so thats a plus.