View Full Version : Alloys change in dia
semtav
12-04-2010, 02:05 AM
If I change from 30 -1 to 20 -1 (lead -tin), can I expect larger dia bullets?
thanks
Brian
captaint
12-04-2010, 02:24 AM
Brian, I think so. Don't have enough experience to say how much. Maybe half a thou or so. Some antimony might make more difference, if you're not shooting BP. Give it shot... enjoy Mike
semtav:
Yes, but it will be very, very slight difference. Here is a good read for you and will help you out with your question:
http://www.lasc.us/CastBulletNotes.htm
44man
12-04-2010, 09:23 AM
Not enough to even try and measure. You need antimony.
semtav
12-04-2010, 10:50 AM
Reason I asked, I'm shooting BP with bullets cast from 20-1 and 30-1.
I'm wanting to get a custom mold that drops a minimum of .410 to .4105 with those two alloys, and the mold maker I will be using uses 30-1 for his test dia.
I just wanted to make sure if I specify .410 dia. , when I switch to 20-1, I will get larger, not smaller bullets.
thanks
Brian
You'll be good to go, however a mold which cast a bit larger is better than one that spits out boolits a bit small as you can always size down a larger boolit.
lwknight
12-04-2010, 03:00 PM
I think that NASA might have some equipment that can detect the difference between the 2 alloys shrinkage. Most of us do not.
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