Getting BHN to 14

[GSSP]

Veral,

I recently read what you wrote here in your forum on another thread. 

" Keep hardness at around 14 bhn for best expansion and weight retention, and do it with ww lead, sweetened with about 1% tin, and air cooled on a pad with a fan blowing across them.  Ambient temperature should be 70 deg F or less.  That will bump the normal 12 bhn hardness up to around 14."



Am I pretty much out of luck until next fall when the outside ambient temps start to fall.  I ask because I just sent in my mold order to you two days back and will not likely receive my mold for 2-3 weeks.  By then the outside temps might not drop below 70 deg F except early am. 

Also, what are methods to ad 1% tin to a 10 lb pot of WW metal?

Fan?  Really?  What does the fan do?

Alan

[Veral]

  If temps don't get down to 70 till early am where you live, you must be awful close to the gates of hell!        I'm kidding of coarse, but we've been away from Arizona long enough that high temps like that seem almost foriegn!

  The fan speeds cooling, but not as much as water quenching, which is why the hardness goes up some.  To calculate percentage  for your alloying, I find it easiest to convert pounds to oz by, multiply pounds by 16, then divide by 100 for 1%,  50 for 2 percent.  Richer tin is wasting the precisous metal if sweetening WW alloy, as it degrads hardness if over 2%.

  1.6 oz gives 10 pounds a 1%.  Half that is adaquate if you want to save some coins. 

  You'll get good hardening under a fan with temps to at least 80 deg F.  If you use a swamp cooler they work very well to get a cool breeze over your bullets, and if temps are high, use a pretty strong fan.  One that would tend to lift your drop pad off the bench.    We are after a quick cool, that's all.