Mixing diferent Lots of the same Powder

[VirginiaHunter]

I normally finish one can and on to the next, if I find I have come to the end of a can I add it to the scale and if I still need more for the remaining round I just dump a bit more on the scale from the full can, then only one round could possibley effected. Then I start using the full can for the rest of the remainig rounds. So far I have not seen any noticable difference or issues (so far).