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Thread: 375 Win. XTR

  1. #1
    Boolit Master
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    375 Win. XTR

    Wow! I finally received my 375 brass from Starline today, & tried a few loads watching for pressure. AA-2015 Per factory email quotes 32.0 grains. The throat on this rifle is deep, & will take std. 38-55 brass no problem. Using the LEE 379-250 boolit PC'd & sized .378 I started a trial of 3 shot groups @ 31 grains of WC-846 (seems to be identical to AA-2015 burn rate with several different calibers I've tried) 31 gr gave me a 2 1/2 spread No pressure problems. Went up to 31.5 grs & wow four rounds @ 2-shot intervals trying to keep a cool bore. I got a .942 group with 3 touching tight & 1 slightly outside left. I know it's only 4-shots but I'm using a bevel based bullet @ about 1850 fps.Powder coated no check. Ran out of prepped brass & daylight, but called time out with hopeful thoughts for tomorrow. Sure wish Jess would get that 5-groove 38-55 completed. Hunt'n seasons comm'in.

  2. #2
    Boolit Master
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    P.S. 50 yds

  3. #3
    Boolit Master

    pworley1's Avatar
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    You are off to a good start.
    NRA Benefactor Member NRA Golden Eagle

  4. #4
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    lar45's Avatar
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    Sounds great

  5. #5
    Boolit Mold
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    Nice! My .375 Win. brass from Starline is supposed to be getting here tomorrow. Looking forward to experimenting with some loads!

  6. #6
    Boolit Master marshall623's Avatar
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    I've been working with my Dad's 375 XTR , I slugged the throat and I had .377 and sizing the the same boolit .379 . The other week I had about a 5" group @ 100 yd using 29gr of RL7 . I shot 5 more at 30gr it went south quick . I've got some more loaded starting @ 27.5 and up in 1/2 gr increments. Hope to get to the range soon . Guys good luck with those 375s

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    Jesus said ( Come unto me, all ye that labor and are heavy laden, and I will give you rest ) Matt. 11:28

  7. #7
    Boolit Master marshall623's Avatar
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    The one I got from Dad is first year production / top eject and it's wearing a Williams receiver sight .

    Sent from my SM-G973U using Tapatalk
    Jesus said ( Come unto me, all ye that labor and are heavy laden, and I will give you rest ) Matt. 11:28

  8. #8
    Boolit Buddy
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    Good boolit, I use the same one in my Jes rebored Marlin and the accuracy is very good.
    Retired: school of hard knocks
    NRA Lifer

  9. #9
    Boolit Master
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    I've found that AA-2015 & this batch of WC-846 is great for full house loads, usually find a their sweet spot at full charge or just under. They are not real versatile to reduced charges like some other powders.

  10. #10
    Boolit Master
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    johnzx6r; Welcome Aboard! Just noticed your post count, Hope you received your 375 brass & have begun testing some loads. Plenty of help & 1st hand experience on this forum. Don't be shy, Ask away at anything you need, we all will help with whatever you may ask. No such thing as a dumb question.

  11. #11
    Moderator Emeritus


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    I was told to compare WC846 to BL C-2 but that was 20 years ago.
    [The Montana Gianni] Front sight and squeeze

  12. #12
    Boolit Master
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    When I purchased this WC-846 powder I was told to use BLC-2 Starting charge minus 10%. then work up. I use it in 223,243,30-30,30-06,308,&358, with almost exact charge weights as AA-2015. Bought the last 2015 that Wideners had when they quit selling powder.

  13. #13
    Boolit Master
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    Absolutely love this caliber and gun it should be fun fine tuning it for hunting and shooting.

  14. #14
    Boolit Master Rapier's Avatar
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    I have a few thumpers, the 375 model 94 XTR is the latest trade. It is the first model 94 I have ever owned, normally avoid them like the plague, buy a Marlin, side eject instead. But this big big bore spoke to me. So can no longer say, I never.
    I have the dies, brass, 270 grain J bullets and the 250 grain plain base, flat point bullet for PC.
    Attached Thumbnails Attached Thumbnails AC4C0935-1CBA-438E-BB69-12CC317DA0F8.jpg  
    “There is a remedy for all things, save death.“
    Cervantes

    “Never give up, never quit.”
    Robert Rogers
    Roger’s Rangers

    There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves.
    Will Rogers

  15. #15
    Boolit Master Randy Bohannon's Avatar
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    I bought mine to treat as a 38-55 WCF +P if the need arises, these are some of Winchesters best rifles of the era. I like 20 grs. of IMR 4759, 250 gr. G/C bullet Ben’s Red lube . I bought 7 lbs of 4759 before it discontinued ,it’s enough to feed the rifle for a long time.

  16. #16
    Boolit Master
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    For my hunting load in my Marlin 336 CB 38-55/ Redfield 1 3/4-5X Widefield:
    38-55 cases , 28 gr Re7/ Lyman 375449, 265 gr GC or the lyman 379248,255PB/0.060LDPE wad.
    Often Clover leafs at 100yds.
    Load also shoots well in my 375Win Contender Carbine
    beltfed/arnie

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check