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Picture of Wstrnhuntr
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Just cast up a few pistol bullets for my 38. I use an old Lyman pot and I had it turned up to about 750*, but I am still getting voids. Do I need to crank the heat all the way up or ? Ambient temp is probably in the low 60's.
 
Posts: 10107 | Location: Tooele, Ut | Registered: 27 September 2001Reply With Quote
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voids are cause by the bullet not having enough alloy available to it during the cooling phase.

pour more alloy over the sprue.
 
Posts: 4954 | Location: soda springs,id | Registered: 02 April 2008Reply With Quote
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And make sure your mold is not cold.


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Posts: 66669 | Location: Dubai, UAE | Registered: 08 January 1998Reply With Quote
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Picture of NormanConquest
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True, I set my mould over the pot while the lead is warming.


Never mistake motion for action.
 
Posts: 17357 | Location: Austin, Texas | Registered: 11 March 2013Reply With Quote
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Picture of Wstrnhuntr
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I always heat up my mold. But I think in the cooler temps maybe my sprue plate wasnt getting hot enough. Gonna try getting that a little hotter, thanks guys.
 
Posts: 10107 | Location: Tooele, Ut | Registered: 27 September 2001Reply With Quote
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Picture of hivelosity
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I have a 9mm 125gr Lee aluminum mold that one cavity always has what appears to be a blemish. I have tried a lot of different mixes and temp and on and on and it is still there. I powder coated a bunch and shot them and they shot good.
 
Posts: 2134 | Location: Ohio | Registered: 26 June 2000Reply With Quote
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A cheap hotplate from Walmart or a thrift store to heat the mould is valuable far beyond it’s cost.
 
Posts: 3 | Location: NW Florida  | Registered: 06 January 2022Reply With Quote
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Picture of mike_elmer
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It could be some contaminate in the cavity, such as bees wax lube, or oil. I spray brake cleaner and blow it out with compressed air to clean the cavities, and this seems to do the trick!
 
Posts: 8421 | Location: adamstown, pa | Registered: 16 December 2003Reply With Quote
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