Another thread I started is basically unrelated, so I'll start one here.
I used to cast COWW: PB 1:1, with enough added 95/5 solder to bring it to Tin 2%, antimony 1%, Pb 97%, trace arsenic. 425 grain bullets cast very well.
I'm thinking of adding in some lead to my 1:1 Pb:No. 2 alloy (est. Tin 1.67%, Antimony 1.67%, Lead 96.7%) for a final estimated 1.25% Tin, 1.25% Antimony, 97.5%, in order to increase the bullet weight closer to 405 grains as cast. You guys see any issues with quality - fillout, etc. - going to this lower tin and antimony content?
On the other hand, I can buy 5# of No. 2 and add it to 40 lbs of my existing alloy for a total of 2% tin, 2% antimony, 96% lead. Weight will be lighter still, but this 2% each of tin and antimony is common, and I'm wondering if it might help with consistency.
Thoughts?