Marlin 375 Win purchase will happen soon--what do I need to know now?
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Thread: Marlin 375 Win purchase will happen soon--what do I need to know now?



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    Marlin 375 Win purchase will happen soon--what do I need to know now?

    I have a 1980 Marlin 375 Win set aside at the LGS for me. I will probably do the deal for the rifle next week. I know that factory ammo is scarce and I will have to reload 200 gr Sierra bullets or hard cast. I do have RL-7/A1680/IMR-4198/H4198 already on hand for reloading. I will have to pick up some brass which can be hard to find. There are many things I don't know about the caliber like:

    1. Can I use new 38-55 brass for modern 375 Win loads since its shorter?
    2. I haven't looked into reforming 30-30 brass to 375 Win. I am sure I can find the MO thread on how to do this or find a Youtube video. Again---since the brass is shorter--can modern 375 Win loads be used with the reformed brass?
    3. Any particular issues to be concerned about for the 375 Win when reloading hard cast? I currently reload hard cast for the 35 Rem/444 Marlin/45-70/30-30.
    4. Anything else that I should be aware of or haven't thought about?
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    250 for $146.50 at Starline free shipping available now.

    GB has 50 for $17 plus $8 shipping

    It's out there from 50 cents a piece to over $2 a piece.

    375W brass has always been thicker than 30WCF brass....still usable...choices
    Last edited by Sweetwater; 01-14-2020 at 12:45 PM.
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    Gun Wizard
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    Congrats. Looking forward to some pics.
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    I've read that Win. 375 brass is heavier, thicker toward the base. I shortened a bunch of Starline 38-55 before Starline ran them to Winchester length to stay on the safe side. Reforming 30-30 brass scares me as that cartridge operates at way lower pressures than the hotter .375 Win. I was lold by Jesse who rechambered/rebored my gun that it can feed both 38-55 and .375. They weighed exactly the same indicating the same amount of metal was in them. I would only load 38-55 loads in reformed brass. Cast loads should work fine when kept in the confines of lead's velocity capabilities. It's little brother, 38-55 has been doin' it for well over a century and a half!

    AC
    Last edited by gunscrewguy; 01-14-2020 at 12:49 PM.

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    Tenderfoot
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    I was at a local gun show last weekend and was able to pick up some Winchester boxes for $50 a box... which I didn’t think was to bad. I would keep an eye out for shows you could probably get some there.


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    "when kept in the confines of lead's velocity capabilities" quote from AC.

    I used to believe this before 1988, then I started casting. Lead in itself does not have, from my experience, a velocity capability. There are many variables at play.

    I'll reduce it to this. 30 caliber cast bullets I have run to 2800fps and still get a round hole on a paper target at 200 yards. 35 caliber I have run over 2500fps with the same results. I have also seen some 40 caliber cast bullets turn to powder at 1800fps. Different alloys have different properties. "Hard" cast can mean a variety of things. Too hard will make brittle and the bullets will blow up on contact. Great for prairie dogs, not so good for rabbits or other edible game. I don't shoot many J-bullets these days and haven't for over 30 years. Cast bullets have brought home the bacon too many times and I take a lot of pride in rolling my own, like Dad and Grampie. They are both gone, but their rifles shoot on.
    Sweetwater
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    Gun Wizard
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    brass is easy to find these days compared to a days gone by. for several years now Starline has been producing 375 win brass and its real good stuff. ive used trimmed down 38-55 brass sized with 375 win die and it needed a good crimp to hold .375 bullet. good load data from powder manufacturers is harder to find than brass these days. but I've found with cast bullets and Imr 4198, re7 and 1680 you can basically fill shell to where base of boolit will seat and its good. I wrote to accurate powders once for load data using 1680 and I could never get as much powder as the recommended into the case with bullet seated properly. also there used to be, several years ago, a guy on gun broker who was making duplicates of the discontinued 220 grain bullets at a very fair price, I still have some and have not looked in years.
    if your desperate for factory loads I think I still have a dozen boxes or something like that, might part with one.

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    Always good to have a box of factory fodder if nothing more than to gauge your own loads against for recoil, noise or velocity. I like it 'cause it shows me that my loads are faster than factory, more accurate, and recoil softer. Just how they are.
    Sweetwater
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    The wait is driving ya nuts!
    Ret_Eng and gunscrewguy like this.

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    I love the 375 and I know you will also. It's a great caliber. I use Starline brass and have great accuracy out of my Winchester 94 Big Bore. I'm in Germany right now and don't have my load data available. I went on a spree when I first got it and currently have enough brass and loads to last my life time. I even bought some 38-55 loads from Buffalo Bore, and I loaded a bunch of 38-55 that works really well. Looking forward to some pics and range reports when you get it. Congrats!
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