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Thread: 308 Winchester using Winchester 748 Powder

  1. #1
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    308 Winchester using Winchester 748 Powder

    Greetings Gents,

    Iím banging my head against the wall wanting more out of my 308 Cast loads. Is there anyone who has tried this combo. I have molds that can cast from 150 grains to almost 200 grains.

    Feel free to share any suggestions you might have. Iím wanting about 2400-2500 FPS with a 180 grain.

    Thanks in advance.

    Bluejay
    You never know how you rank amongst men 'til you have seen what will break another man.
    The original "Bluejay" US Army/ US Navy 1945-1970.

  2. #2
    Boolit Master
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    wow bluejay.. you want em going fast.. i am not saying it cant be done, but its gunna require a special alloy, and will be prone to issues... the guy to talk to is Larry...

    marko
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    Boolit Grand Master


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    Many times what we "want" and what we get are two different things. Yes, you can easily get 2400-2500 fps with a 180 gr cast bullet using 748 in the .308W. Getting any accuracy (precision) is another matter.

    Would help if you told us what 180 gr cast bullet?
    What rifle?
    What length of barrel?
    What twist?
    Larry Gibson

    ďDeficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.Ē
    ― Nikola Tesla

  4. #4
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    The MP Molds 180 grain mold. The one that came as a 3 banger HP.
    Savage 110
    17 inch barrel
    1:10

    Any suggestions welcomed Larry. Even if it is to change powders.
    You never know how you rank amongst men 'til you have seen what will break another man.
    The original "Bluejay" US Army/ US Navy 1945-1970.

  5. #5
    Boolit Grand Master popper's Avatar
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    I've gotten 2400+ (170gr FP) from 16" 1:10 AR10 (LR308 carbine). With accuracy. It takes a harder alloy with 0.3-5% CU added. 3 shot just above MOA @ 200 good enough? Just playing with a friend in a field shooting steel.
    Whatever!

  6. #6
    Boolit Buddy
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    Quote Originally Posted by bluejay75 View Post
    The MP Molds 180 grain mold. The one that came as a 3 banger HP.
    Savage 110
    17 inch barrel
    1:10
    I have used W748 with cast in 308 many years ago... can not find data I used .... Used in a M1a Clone and a Sako

    w748 with cast and 308 cost is a bit more than other powders as you use more. its a good powder as it measures well

    RCBS Cast book has some 308 loads using W748
    from the book for a rcbs 30-180-sp 36.0 = 1921 max 38.0 = 2023fps .... no pressures given

    I would think the 36.0 load would be the max for the 10 twist

    My favorite load was with SR4759 in the bolt gun Discontinued

  7. #7
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    Quote Originally Posted by popper View Post
    I've gotten 2400+ (170gr FP) from 16" 1:10 AR10 (LR308 carbine). With accuracy. It takes a harder alloy with 0.3-5% CU added. 3 shot just above MOA @ 200 good enough? Just playing with a friend in a field shooting steel.

    What powder good sir?
    You never know how you rank amongst men 'til you have seen what will break another man.
    The original "Bluejay" US Army/ US Navy 1945-1970.

  8. #8
    Boolit Master

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    What is your accuracy requirement?

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    Quote Originally Posted by Silvercreek Farmer View Post
    What is your accuracy requirement?
    I could live with 2 inches at 100
    You never know how you rank amongst men 'til you have seen what will break another man.
    The original "Bluejay" US Army/ US Navy 1945-1970.

  10. #10
    Boolit Bub
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    Win 748 is funny powder it gets lazy when the temps rise the pressure falls off and gets violent when it's cold pressures rise. I have several older manuals that list loads for the 308. Just send me a PM and I'll send what I have.

  11. #11
    Boolit Master
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    I also have a Savage .308, Model 12, 26" bbl and I have shot a bunch of the Lee 309-180 bullets in it. Powder coated and gas checks. Sized to .309.

    This load was estimated to be around 2400fps (34gn of Varget has been measured at 2150fps, 32gn was 2000fps). I never fired that high a vel load again. It was just to prove to myself that the powder coated bullets would shoot ok at that velocity. That was 200yd so less than 2MOA (getting close to 1MOA).


    Click image for larger version. 

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    FWIW, I use Varget because of the temp stability.
    Last edited by charlie b; 05-28-2020 at 10:17 PM.

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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