Cooling affecting final size

[pearcetopher]

Hi fellow casters

Ive noticed my lee .356 125 2R mold drops at .356 if I water cool my boolits

If I air cool them they seem to come out at .3575

Does it make a difference or has something else changed here

[cbrick]

Same alloy cast at the same mold/pot temp measured the same amount of time after casting in the same room temp with a micrometer and not a caliper?

Rick

[MtGun44]

How are you measuring? I am not convinced that this is possible without
other changes like alloy or casting temp or how tight the mold is closed, but
perhaps it is possible.

Bill

[Down South]

Same questions that cbrick asked? Anyway, sounds like you are casting for a 9mm? If the boolits are actually .3575 then that's probably a better size for the 9mm than .356. I size my 9mm boolits to .358 to prevent leading.