WW Variation

[tenneesse]

while casting some WW's I experienced about 5 gr.'s of variation in bullet weight. Can someone give me some insight to what I can do to get to closer to 2 or so grains.

What would it take to have no variation?

I have bought some commercials and from vendor to vendor I would have one vendor with less than 2.5 gr.'s and the next over 5 gr.'s variation.

Why does this happen. I sort mine and remelt about 50%, those outside 2 gr.'s.

I was casting .45's (230), .454 (310gr), .44mag (200gr) and plan to cast some 9mm shortly (124gr)

[jondavis0904]

in my readings on this forum I have learned that WW will vary due to the alloy not being the same in all wheel weights from different companies. most common solution i have seen is to take all your WW and mix them together. and then smelt.

[dtknowles]

Without knowing more details about your process I can only make a few guesses. First, do you monitor pot temperature? Temp variations can cause weight variations. Are you using a multicavity mold? This can cause variations a couple ways, differences in the cavities and the mold temperature will vary as you fill the various cavities. Casting speed, if you vary that you will get variations.

Tim

[runfiverun]

well just today i was melting up a big batch of alloy.
it will be 1600 lbs when done.
i take all the alloy i smelt and clean over the summer and segregate it into batches.
i then bhn test it all then figure out how much of what needs to go through the pots again to have a bhn the same as the last big batch.
this one works out to 4 lbs 2 lbs 1 lb from the three batches.
then another batch will be mixed up using 4 lbs of alloy to one lb of linotype.
this one will be kept separate because it isn't the same make-up, but it will be all used up for one boolit.