Lee 44 cal mold

[BW64]

I have a Lee 44 cal. 240 grn mold that was producing 240 ish boolits consistently the first few times I used it. Now for some reason it's throwing 250 gn boolits! Can it be the lead?

BW

[BBQJOE]

Has to be your mix.
Or your scale.

[45-70 Chevroner]

Are the mold faces clean? If you get some lead inbetween the mold faces it can hold the mold open enough that the boolits will be heavier.

[Kraschenbirn]

First question that comes to mind: what alloy/mix are you using? You're indicating a roughly 4% increase in weight which could easily be caused by a change in the mix of your alloy. Boolits from my Lee 44-200-RNFP run about 196 gr cast from straight WWs but weight increases to 204-205 gr cast from 50/50 WWs/range scrap...the range scrap having a typically high percentage of pure lead from jacketed handgun rounds.

Bill

[BW64]

Checked on 2 different scales, mold faces are clean so mold meets perfectly & using the same WW lead as last casting. I also noticed my 38 mold of 125gn is throwing about 129gn. My 9mm is dead on at 125gn & my 45 is also dead on at 200gn. Thanks for the input guys.


BW

[runfiverun]

ww lead isn't iso 9001 controlled it is lead and stuff made to balance a tire and weigh about the same weight from weight to weight in a mold.
your variation could be as simple as the alloy.
it could also be an alloy temp variation or mold temp variation combination.