Just had to know!!! On my Pact, bud-light pull tabs weighed, 4.7, 4.7, 4.8, 4.7, and a couple w/ visible "hangnails" 4.9, 5.2, 5.1. Haven't had my ole 505 out for years but on the same tabs 4.7, 4.6, 4.7, 4.6, w/ "hangnails" 4.8, 5.0. 4.8... Hope this helps as I too am amazed at the uniformity... but As stated previously, if I wanna know I just weigh a quality name bullet!!! Marty