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February 22, 2009
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After reading several posts about 375 SM Brass, I've decided to have a go at showing my method for making 375 SM Brass from 375 WIN Brass:
Select and lube the 375WW brass.
Run brass all the way up the expanding die, notice the bulge after expanding; it's OK, that part is removed.
Using a copper tube cutter (I used to use a dremel), place the cutting blade under the bulge and start cutting; SLOWLY. You don't want to crush the ends too much.
Run the cut brass through a deprime/ resize die.
Trim to length on a case trimmer. If you don't have one, get one. You'll need it eventually if you reload.
Check to ensure the length fits your chambers.
The center piece is IHMSA 375 SM Brass, the outsides are cut brass. Now you're ready to reload….
Hope that helps,
Ron
Technically, the glass is always full; half liquid, half air....
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December 4, 2011
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That seems so simple, why didn't I think of a tubing cutter? Is that forming die a special die? If so, where do you get them? Is that just the resize/deprime die you are using for forming?
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February 22, 2009
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Not a special die, just the second of a three die set. I guess it's actually the expanding die. I'll edit the post. Probably an unnecessary step- I just run the expander down to near OAL for a guide… I suppose you could just mark the brass and start cutting.
Thanks.
Edit: FWIW; I just finished trying to cut brass without expanding first. What I discovered was the brass would get crushed a bit more during cutting and then the mouth on a few (2 of 5) would cave in when expanding to fit a bullet. I'll stick with my original method.
Technically, the glass is always full; half liquid, half air....
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January 24, 2009
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That's a nice tutorial Ron, thanks for taking the time to do this!
I like the tubing cutter idea, although I'm surprised the cutter wheel doesn't try to "thread" the case, due to the uneven case diameters where the rolling wheels are concerned.
In any event, it looks like it works nicely.
July 23, 2011
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yes thanks ron for taking the time for this , it helped alot , great pics
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November 17, 2008
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When I make 30 Herretts from 30-30s, I have a die that you run the case up in then use a hacksaw to cut off the excess. Is there no such die for 375s? Maybe our resident master machinist could build one. Sorry Eric ,not trying to cause any more work for you or any thing. 
LB
Wisdom is merely the realization of how little one knows, therefore I am wise.
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May 2, 2009
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lbruce said:
When I make 30 Herretts from 30-30s, I have a die that you run the case up in then use a hacksaw to cut off the excess. Is there no such die for 375s? Maybe our resident master machinist could build one. Sorry Eric ,not trying to cause any more work for you or any thing.
LB
File trim die?
SHOOT
April 25, 2008
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Yes there is a file trim die for the .375 SuperMag. One of my die sets came with one.
The Savantist
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February 22, 2009
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yep, I have a trim die, but not until recently. That's why I used the dremel and now a tube cutter...
Technically, the glass is always full; half liquid, half air....
May 3, 2011
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Thanks Rwsem for the pics and tutorial. Thats a very good idea. Nothing is too good for our little friends.
May 3, 2011
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I had another thought rwsem on the brass. They say Win. 30-30 brass is superior to Win. .375 brass. The problem in cutting the brass is that its not strong enough or consistent enough to do it properly all the time. Except maybe for the way you are doing it. I was wondering if we filled the brass with water and freeze it if it would be much easier to cut. The reason I say this is because when you look at a brass trombone and trumpets and other instruments like that, they have several turns in them. They fill a straight brass rod up with water and freeze it. Then they put it on a jig and wrap it into the design that they come up with. The tubing never kinks because of the frozen water in it. Just an idea.
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February 22, 2009
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Hey Gary, I've never heard about how they make trumpets etc.. may be interesting. I have however tried 30-30 brass but it's thinner than the 375 and so I tossed it out when I came into 375 brass.
Technically, the glass is always full; half liquid, half air....
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December 4, 2011
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Never heard of using frozen water for bending, but I HAVE heard that they use fine sand to reinforce the bends.
Anything worth doing is worth doing well.
My father
If a man designed it, and a man built it, then a man can fix it.
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January 22, 2008
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Ron, thanks for posting this information and everyone else for contributing. I have a 375 but have never gotten around to shooting it.
April 25, 2008
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What? Jody...you HAVE to fix that problem. They are a blast to shoot!
The Savantist
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January 24, 2009
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IHMSA80x80 said:
What? Jody...you HAVE to fix that problem. They are a blast to shoot!
I agree! I love shooting mine, it's pretty much my all around favorite DW to shoot.
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