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Discussion Starter #1
I've just begun casting bullets for handguns. I'm using a Lee .476/400gr for my .480 Ruger, scrap wheel weight alloy (although I got some alloy from a friend that may have some tin added) quenched in water. They are unsized, straight from the mold.

The problem is the bullets don't seem to be a consistent size. I mic'ed the bullets and the diameters varied more than I expected, so I ran them through one of the cylinder throats (to validate my measuring technique) and they went through with anywhere from very slight pressure to requiring a hammer and a cleaning rod to get through. I had previously loaded some from the first batch I cast and it was apparent when seating and crimping that the bullets were inconsistent. I don't have a scale that goes to 400gr so I didn't haven't weighed them.

Any ideas? Will a sizing die solve the problem effectively? I thought it might be the alloy, but these bullets are all coming from one pot that I Magnefluxed. The mould temperature should be pretty consistent as I'm timing the interval between casts. Visual inspection of the bullets did not reveal significant differences.

I haven't fired any of these bullets yet because of my quality control problems, so can't update you on the accuracy.

Thanks.
 

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The Hog Whisperer (Administrator)
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Carefully clean the faces of the mould blocks and the alignment pins & recessees to ensure that they can close fully.  Do the blocks look like they are closing fully and is there any play in them when shut?  

Try to hold them shut with the same amount of pressure for each cast.

Are you measuring the bullet diameter in the same place on every bullet?  That is, if you measure one bullet across the parting line of the mould, and then another 90 degrees from that, you would expect to get some variations.  But since you tested these by pushing through the cylinder throats, this is probably not an error of measurement on your part.

A sizing die will certainly make the bullets more consistent, and this is good, but it is best to have them drop out of the mould as consistent as possible.

There is a lot of technique to casting good bulllets and some of it just requires a lot of practice.
 

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antitiem
  You say you magnfluxed a lead bullet? I used to opreate a magnifluxe machinewhen I worked atGreyhound many years ago and it worked ony on iron products Am I missing something here?
tbc
 

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Discussion Starter #5
Right, Jack. <!--emo&:)--><img src="http://beartoothbullets.com/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'><!--endemo-->
 

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antiatem

  Okay ,I was wondering if something new was happening.I recently heard that someone had come up with a brass magnet and I was under the impression that only iron was attacted to a magnet. You never know what "they" are going to do next.
tbc
 
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