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April 9, 2015
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Respected DWF elders,
Can you please educate me about this caliber? I am considering buying an AS NEW Perfect Condition 375 Super Mag. I am a re-loader of every caliber gun I own, but this caliber is basically new to me. I know next to nothing about the 375 Super Mag Caliber. My understanding is that I will need to make my own brass by trimming and re-sizing some other "more common" rifle brass. What is the availability of bullets and I am imagining it uses Large Rifle Primers?? To handle the Pressure.
As you have so graciously done in the past, I respectfully request a lesson and I will dutifully search the interwebnetscloud to amass my own research.
Much Obliged.
“We cannot but pity the boy who has never fired a gun; he is no more
humane, while his education has been sadly neglected.”
-Henry David Thoreau
“When some of my friends have asked me anxiously about their boys, whether
they should let them hunt, I have answered, yes – remembering that it was
one of the best parts of my education – *make* them hunters.”
-Henry David Thoreau
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Dans Club
December 4, 2011
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Brass is the though item to come by, you can cut down 375 win if you can find any of that. Dies take some searching but are out there. They won't be carbide so you'll have to lube your cases. Large rifle primers work well. Bullets are getting easier to find, Sierra now has some 200 gn round nose in stock but the Honady 220.are basically extinct. I'm going to vet one of the bullet casters from the gun shows to do a run for me one of these days. That's about it other than to say that best accuracy is achieved running the bullets fast.
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.
My grandfather
DWF Supporters
February 1, 2016
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Black Dog ammunition has them loaded, they are over 100.00 for 20 + shipping 
SIZE DOES MATTER
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Dans Club
February 9, 2009
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Scorpio hit most of the points already. I have not had nearly the success with the Sierra 200 grain bullets as I have with the now extinct 220 grain Hornady's. If you can round up a source for bullets that is great. The cutting down of brass is tedious and time consuming, but the .375 Winchester rifle brass is the best to do this with, stay clear of the 30-30 brass if possible. It is thinner and does not perform as well long term.
SMF
A man cannot have too many SuperMags
April 25, 2008
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Scorpio and Supermagfan have hit all the points. The dies will run over $180. You will be miles ahead if a set comes with your revolver. I have both original and cut-down brass. Fed Large Rifle primers worked best for me, either H or I-4227 was the best powder. Now that the Hornady 220 grain bullet has been discontinued, I'm about to start testing the Sierra 200 grain FN. I want to try the Speer Hot Core 235 grain bullet, but I don't know if the twist rate is enough to stabilize them. Meanwhile, I will hoard my stash of Hornady bullets, only 5 boxes left.
The Savantist
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Dans Club
February 22, 2009
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Technically, the glass is always full; half liquid, half air....
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January 24, 2009
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IHMSA80x80 said
Meanwhile, I will hoard my stash of Hornady bullets, only 5 boxes left.
I'm down to my last box.
Those Speer 235gr bullets might be good, though. I will have to try some as well.
DWF Supporters
April 9, 2015
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Thanks for the information kind sirs. Gonna be hard for me to justify a purchase of a gun that I won't be able to shoot. I like the "uncommon" factor of the gun and the round, it is in excellent condition, comes with dies and brass, (gotta find out how many) but I like to shoot my guns and not just let them sit in the safe. Part of the fun of ownership could be the constant never ending search for brass and bullets. I already cut and size .223 to make 300 Blackout and that is easy enough but .223 is the most common brass and .30 Caliber bullets are the most common bullet. I think I am going to let this one simmer on the back burner for a while.
“We cannot but pity the boy who has never fired a gun; he is no more
humane, while his education has been sadly neglected.”
-Henry David Thoreau
“When some of my friends have asked me anxiously about their boys, whether
they should let them hunt, I have answered, yes – remembering that it was
one of the best parts of my education – *make* them hunters.”
-Henry David Thoreau
April 25, 2016
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If the price is right don't hesitate and jump on this rare gun. I have owned two Sevilles in 375SM and both were extremely accurate with cast bullets. Forming brass from 375 Win is easy. If you get a trim die most of the excess brass can be cut off quickly then use a trimmer to bring to final length. Nothing to it. Since you will get the dies then you don't have to worry about that. They will probably be Redding dies. I shot many different types of cast bullets in my Sevilles mostly about 240-245 grain bullets for silhouette shooting. I used a light load of H4227 and the bullets stabilized well. Don't know the twist of the Seville barrels but suspect the Dan would be about the same. A friend of mine still has his 375SM Dan and all he ever shot out of his Dan was cast bullets. I'm sure one of the major cast bullet makers can fix you up with bullets if you don't cast your own. I'm surprised that people think making 375SM brass is difficult since all it takes is trimming cases. I still have my expander die to expand 30-30 brass to 375. Reformed 30-30 brass will work just fine if you don't use maximum loads in the 375. Great cartridge and I think you will be surprised how accurate it will be.
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Dans Club
February 22, 2009
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The hardest part in cutting down 375WIN brass is finding the brass (at a fair price). Of course if someone wants to and they can find a box of 375 WIN- send it to SOWELA. I'll launch the projectiles and send the empties back- free of charge! I have a WIN 94 that likes to be fed.
Technically, the glass is always full; half liquid, half air....
DWF Supporters
February 13, 2012
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I too have been looking at one of these for sale (the seller says it "looks unfired" and the price is around 1000.). It would be nice to own something unusual. No 375 win brass to be seen but It looks like star line has 38-55 brass which I would guess I could use(????). But I can't find any dies. Of course the gun doesn't come with any. Is it that hard to actually find them if I take a chance on the gun??? Thanks for any advice you can give me😊
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Dans Club
February 22, 2009
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In a pinch, you can use 30-30 WCF until some 375 comes around but they just can't handle max pressure rounds. Reeds can load some if you don't have the dies. Keep your eye out on GB or other auction sites for brass and supermag dies or you can get them from places like midway usa but they're pretty expensive (Redding). CH4D can turn a set out for a bit less but it'll still be expensive.
Technically, the glass is always full; half liquid, half air....
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Range Officers
May 2, 2009
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Does 375 supermag just use standard 375 win dies? I may have a set.
SHOOT
March 25, 2008
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with the standard 375 win you will have to shorten the die. 
DWF Supporters
February 13, 2012
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Thanks for the replies. 🙂 I did find a link to the special order dies. Now I have to figure out if I want to spend that much more on reloading for another caliber when I've got all those 44 casings calling my name lol
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January 24, 2009
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If it's any help, I have come to the conclusion that the .375SM is truly a wonderful caliber to shoot...to me, it's really smooth. It has that perfect combination of "boom", with a lesser than expected amount of "sting" to the palm. It hits similarly to a .44, but with a lot less recoil. The only bummer these days is finding a bullet manufacturer to supply the bullets!
Many reloaders roll their own, I haven't gone there yet.
Here's my two .375's...a DW SuperMag & a single action U.S.A. (United Sporting Arms) Seville.
DWF Supporters
February 13, 2012
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Sooo. If theoretically speaking, I had to choose between the 375 for 1050 and a 357 supermag (with 500 used cases) for 1000 or a 4" .41 mag for around the same price, all blued (and there is no way I could buy all of them at the same time because I actually like living in my home), what should I do??????
I like the idea of having something unique, but I have dies and bullets for my 15-2 .357 so I might save a lot of hassle. Ugh. If I had less money or a whole lot more money I might be better off compared to overthinking this.
🙂
February 16, 2016
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The 375 is a wildcat cartridge, with all the associated problems.
The 357 Maximum is awesome because it will shoot anything from .38 Spl. the +P's, Magnums and the Maximums.
The 41 is a sweet shooter, but a less available cartridge.
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