While we are focusing on weight I'm not sure that is the prime thing. Never weighed my measle ball. Hitting other balls I would say it is heavier. However it also rolls longer than the red circle balls I compared it to. This was in actual play.
It is possible that it was lighter but had a different cure, heavier with a different cure, I don't know. Ultimately in play it doesn't matter but for those that like to contemplate the lint in their belly button it is interesting to ponder why the ball plays differently.
Hu
As long as friction, speed and all other factors (same table, decent cloth, testing on the same day within a few minutes) are equal it makes sense that a heavier ball would roll farther due to its increased momentum (force x mass).
FWIW, I have an Aramith measles ball (I believe it is the PC-90 Super Aramith Pro Cup) that has relatively low miles on it (home use only, still looks real shiny) and the CB from the Aramith Premium set on my table. The latter has the Aramith logo on it that is a very dark blue, almost black. This one has far less use than the measles ball and is the one I carry with me for those instances where it can be used in league play on Valley bar boxes.
When I have been able to sub it on those tables there is a big difference in the way it performs but I would expect that due to how trashed the house CB typically is.I did recently sub it at the Eagles lodge because the house CB had a significant gouge in it, but only after convincing a measles ball hating opponent on the opposing team that mine was the same size as the house CB.
Both of mine measure 57.08 mm according to a go/no go type of measurement using a pair of digital vernier calipers. The measles ball weighs 168 g and the premium weighs 165 g on a digital postal type scale, using repeated trials.
Looking at them in bright light, the measles ball is whiter than the premium, which is more of a cream color in comparison. I have not done any sort of comparison testing between the two but 3 grams would have to make some sort of difference.
Since the local venues mostly no longer open up the coin op tables for league I am considering getting a 31-430 Aramith magnetic CB for that use. According to Pool Dawg, these weigh approximately 6 oz (168 g).