Weight Variation

[45 2.1]

I got a used, but new to me SC 31141 mold the other day. The previous owner had left a boolit in the cavity which hadn't but cut yet as the sprue was in place. It must have been linotype as it was shiney and weighed 166 gr. I cast some out of my own alloy, they weighed 180 gr. Quite a difference......................... Any of you experience that much difference from different alloys out of the same mold cavity?

[Cherokee]

Yep, sure have. From Linotype to WW will do it, even more for me in a 45 cal bullet.

[454PB]

Yup, and if you use some monotype, it will be even lighter.

[Kraschenbirn]

I'd say your mould is casting about what it should. My 311041 casts 174-175 gr. (Lyman Handbook says 173 gr) from straight #2 alloy and right at 171.5 gr. from the 3 part #2/1 part linotype mix I use for rifle boolits. Add a gascheck and lube and they weigh out at 173.0 +/- .2 gr.

Bill

[joeb33050]

I weigh almost all bullets cast and keep records of the average and SD of the weights.My 31141 is an old DC mold, with punch marks to show which cavity-"Bottom Dot" = front cavity, "Top Dot" = rear cavity.
I looked up the last 6 times cast with this mold.
"Soft" = ~ lead
Bottom = 176.1 gr., Top = 175.3 gr.
"Lino"
B = 162.8 gr., T = 162.2 gr.
B = 163.6 gr., t = 162.9 gr.
Other mixes weighed in between.
So ?lino to ? lead went from B = 162.8 to 176.1
(I don't really know what I get when I buy "lino" or "lead".)
joe b.