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Very Hot Topic (More than 25 Replies) Brass Molds. (Read 7641 times)
frnkeore
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Re: Brass Molds.
Reply #15 - Mar 16th, 2015 at 1:02pm
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That's quite a mold, Bob. I think I'd have to do some weight lifting to be able to use it Smiley

Have you weighed it, full of lead?

How are the cavity inserts held in it?

Frank
  

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graduated peep
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Re: Brass Molds.
Reply #16 - Mar 16th, 2015 at 1:08pm
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frnkeore wrote on Mar 16th, 2015 at 12:42pm:
The brass relines that I know about are dovetailed into the mold blocks, like those made by Schoyen. I have one that was done that way, also. It's a Winchester mold and the dovetailed brass is tight into the mold halfs but, there is a short set screw added from the outside to aid in holding, also.

An advatage to that is that you can make a bullet, longer than the orignal block.

Frank

Of course ! That makes sense.
dovetailing would provide a mechanical means  of locking the insert in place providing it was a press fit.
So, then how did they accurately close the two halves over the cherry ????

  

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harry_eales
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Re: Brass Molds.
Reply #17 - Mar 17th, 2015 at 5:59am
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A friend of mine in the USA wanted a PP Bullet for his Martini Henry 577/450 rifle. Now he is a sensible chap and won't buy anything if he can make it himself. So from somewhere he obtained a damaged Lyman bullet mould, set it up in a four jaw chuck on his lathe, made a 'D bit' and bored out all of the original bullet shape.

Then separating the moulds he proceeded to braze up the interior of the two halved using a Low Fuming Bronze brazing rod and a very good quality flux to ensure that there was good adhesion between the two different metals. Once cool all surplus bronze was removed and the blocks united and returned and centred in his four jaw chuck. Another 'D bit' was ground to the contour he wanted on the bullet. This bit was used to bore out the mould to the dia., he required. Finally the vent lines were scribed into the bronze to lie up with the originals. It works really well and cost only a few Dollars to do. Smiley
Pictures to follow.
Harry

« Last Edit: Mar 17th, 2015 at 6:25am by harry_eales »  
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marlinguy
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Re: Brass Molds.
Reply #18 - Mar 17th, 2015 at 11:59am
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Harry, I think your friend did an outstanding job, and that might well be what was done to my mold! Mine don't have the small dovetail added at the bottom though.
The mold I have appears to also be thicker brass surface, and maybe when it was brazed, the cavity was filled completely to prepare for recutting the mold? It looks like the recess in my mold measures almost 1/2" wide, so it was drilled out pretty large prior to fitting the brass.
  

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Re: Brass Molds.
Reply #19 - Mar 17th, 2015 at 12:30pm
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harry_eales wrote on Mar 17th, 2015 at 5:59am:
A friend of mine in the USA wanted a PP Bullet for his Martini Henry 577/450 rifle. Now he is a sensible chap and won't buy anything if he can make it himself. So from somewhere he obtained a damaged Lyman bullet mould, set it up in a four jaw chuck on his lathe, made a 'D bit' and bored out all of the original bullet shape.

Then separating the moulds he proceeded to braze up the interior of the two halved using a Low Fuming Bronze brazing rod and a very good quality flux to ensure that there was good adhesion between the two different metals. Once cool all surplus bronze was removed and the blocks united and returned and centred in his four jaw chuck. Another 'D bit' was ground to the contour he wanted on the bullet. This bit was used to bore out the mould to the dia., he required. Finally the vent lines were scribed into the bronze to lie up with the originals. It works really well and cost only a few Dollars to do. Smiley
Pictures to follow.
Harry


Very nice work indeed.
I would have been concerned with gas voids in the braze, but your friend certainly nailed it.Not a gas or slag pocket in sight.

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harry_eales
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Re: Brass Molds.
Reply #20 - Mar 17th, 2015 at 1:03pm
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Marlinguy,
I think the filled hole at the bottom of the mould may have been for a hollow pointing plug for the original calibre.

GP,
My friend has over 50 years experience in metalworking. To say he is exceptional would be an understatement. Dammit, I'd love to have his workshop. As far as I am aware he has no CNC machines or EDM machines, like me he is a handle cranker, I just wish I was half as good as him. Cry  He hopes to retire this year and then I expect to see some beautiful creations emerge from junk actions he already has or will acquire. Shocked
Harry
  
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Re: Brass Molds.
Reply #21 - Mar 17th, 2015 at 3:46pm
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That is some fine work. We forget the "Old Guys" did not have a vertical mill to knock out a new mold, nor a gas torch to fill the recess. The dovetail, as Frank suggested, could be cut with a file or hand shaper. Wonder if they put the blocks in the forge with fire clay dams and filled the cavity with spelter (brass chips) and flux and essentially, cast the insert in place. Would take some skill, but they had it and easier than making a new mold.
Chuck
  
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Re: Brass Molds.
Reply #22 - Mar 25th, 2019 at 9:28pm
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This is a mold with brass inserts. I've owned two of these, the other was smaller and cast a short tapered 32 bullet, I assume that they were made by Schoyen or Peterson in Denver. This mold casts a 192 grain 32 bullet with a .328 base;
« Last Edit: Mar 25th, 2019 at 11:02pm by Schutzenbob »  
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Re: Brass Molds.
Reply #23 - Mar 26th, 2019 at 12:58am
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'Bob,
Thanks for bringing this post back up, this bit about the brass inserts is interesting AND it brought an old friend back to our memory, I miss Harry and what he'd bring to the forum.
Dale, how is the brass mold treating you?
  

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Re: Brass Molds.
Reply #24 - Mar 26th, 2019 at 7:20am
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Hey GT, Ordered one from Accurate Molds just a week ago for my Hepburn. So about another 2 week wait. Will let you know. Dale.
  

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Re: Brass Molds.
Reply #25 - Mar 26th, 2019 at 9:03am
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I have this mold on loan to try in my 28-30. It would seem that Pope used a groove in the insert to locate  and then a screw to lock the insert in place .
Dales
  
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Re: Brass Molds.
Reply #26 - Mar 26th, 2019 at 9:13am
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I'll bet you will have it this week. I have ordered molds from Accurate and had them in hand in 5 days. He has his act together for lead time reduction.....which was my career. I would love to see the operation. ALL my Accurate brass molds are the most predictable molds that I own.
  
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Re: Brass Molds.
Reply #27 - Mar 26th, 2019 at 10:17am
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Since this post was originally started I bought a Ballard Long Range #7 in .44-100 Ballard that came with an Old West nose pour adjustable base mold. It can vary from as heavy as 535 gr. down to around 475 gr. weight. Bullets drop nicely from the mold, and look great. I doubt I'll use it as it's a paper patch mold and I don't plan on going that direction. But I wanted to try it out to see the weight difference the adjustment has.

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« Last Edit: Mar 26th, 2019 at 12:14pm by marlinguy »  

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Re: Brass Molds.
Reply #28 - Mar 26th, 2019 at 11:50am
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I tend to lean towards brass molds if given the chance, the one's I've made from brass tend to turn out the best too.  I'm using one I made recently to make core's for a PP bullet for a 44-85, I notice this one is very temperature specific on a given day, varies only about 5 degrees or less (according to the PID controller) where the bullet ends up with flash when it's too hot and voids when it's too cool.  My iron and aluminum don't seem to be quite as picky but they don't cast nearly as pretty a bullet either...
Greg
  

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Re: Brass Molds.
Reply #29 - Mar 26th, 2019 at 12:16pm
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I love that .28 cal. mold Dales! Very cool!
  

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