25 caliber mold for slugs

I was seeing more variation out of the 25 cal mold I had. Is one grain variation acceptable? Once I poured for awhile I would take a sample batch of one mold and set aside to see variation from cavity to cavity. About Two tenths across all four but I could not hold to that while pouring. I had close to 1.5 to 2g variation as I weighed them. Going to stick with the one mold I have now and see if I cant get better at pouring.
Yes mine variations as well, you can weigh them and separate if more than two grain one way or the other for accuracy, or do as I do keep everything in a range 6 grains up or down I keep the rest throw back in pot!