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Thread: Lee C312-185-1R in the 300 Blackout ?

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    Boolit Master brstevns's Avatar
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    Lee C312-185-1R in the 300 Blackout ?

    Has anyone tried the Lee C132-185-1R in the 300 Blackout for Ar15 use. Like to hear about your results.

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    Boolit Master RU shooter's Avatar
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    Yep back when I had a 300 BO , mine was set up for full power loads only as it had a 20"12 twist barrel . That 185 was the second most accurate cast bullet in mine first was the rcbs 165 . mainly used slower than the normal powders in mine REloader 7, 4198, and even a full case of 4895 all functioned and shot well
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    In my Blackout my throat was too tight for the nose of the 312-185 so I used the Harris bullet the 312-155 meant for the 7.62X39. The Harris bullet functioned very well and shot well also. While the 312-185 wasn't successful in my Blackout it works well in most other .30 caliber rifles and specially the .30-06 03-A3.

    Ken

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    Boolit Master brstevns's Avatar
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    Quote Originally Posted by RU shooter View Post
    Yep back when I had a 300 BO , mine was set up for full power loads only as it had a 20"12 twist barrel . That 185 was the second most accurate cast bullet in mine first was the rcbs 165 . mainly used slower than the normal powders in mine REloader 7, 4198, and even a full case of 4895 all functioned and shot well
    Do you recall what it was sized to and maybe a load for the 4198?

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    Boolit Master RU shooter's Avatar
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    Seem to remember my barrel liked .310 and my mould dropped .301 nose which just scuffed the lands . As far as the load goes can't remember the grs exactly but was darn near full case with any of those three powders with no pressure issues
    If you find yourself in a fair fight, your tactics suck!

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    Boolit Master brstevns's Avatar
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    Quote Originally Posted by RU shooter View Post
    Seem to remember my barrel liked .310 and my mould dropped .301 nose which just scuffed the lands . As far as the load goes can't remember the grs exactly but was darn near full case with any of those three powders with no pressure issues
    Thanks
    Need to make up a dummy round and see how it goes. From what I have found around 10.5 gr for the 4198 and a 220-230gr bullet so would think 10.5 should be safe .

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    Quote Originally Posted by skeet1 View Post
    In my Blackout my throat was too tight for the nose of the 312-185 so I used the Harris bullet the 312-155 meant for the 7.62X39. The Harris bullet functioned very well and shot well also. While the 312-185 wasn't successful in my Blackout it works well in most other .30 caliber rifles and specially the .30-06 03-A3.

    Ken
    " The 30-06 03-A3 " Maybe in one with a two groove barrel like mine ? Tell me what you have discovered .
    I bought the C312-185-1R for the 303 British ( No4 MKI ) hadn't considered the 03-A3 and 2-groove barrel ... it works well ?
    Was thinking this boolit , 30-06 and 13 grs. Red Dot in the old 03-A3 for tin cans and paper targets .
    Gary
    Certified Cajun
    Proud Member of The Basket of Deplorables
    " Let's Go Brandon !"

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    Boolit Master brstevns's Avatar
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    Any new updates

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    Quote Originally Posted by gwpercle View Post
    " The 30-06 03-A3 " Maybe in one with a two groove barrel like mine ? Tell me what you have discovered .
    I bought the C312-185-1R for the 303 British ( No4 MKI ) hadn't considered the 03-A3 and 2-groove barrel ... it works well ?
    Was thinking this boolit , 30-06 and 13 grs. Red Dot in the old 03-A3 for tin cans and paper targets .
    Gary
    I've used the Lee 312-185 sized to .311" in most of my thirty caliber rifles, usually in front of 16 grains of 2400 (I had that and didn't have Red Dot). Seems to work okay for my plinking loads.

    Quote Originally Posted by brstevns View Post
    Any new updates
    No hands on experience, but I remember thinking as I was perusing loading manuals that the .300 Blackout with at least some loads was pretty close to the ballistic equivalent of a .32-40.

    I have next to zero interest in an AR, so I probably won't try it. Probably.

    Robert

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    Boolit Master brstevns's Avatar
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    Single Action and bolts have always been my favorite, but after turning 70 I thought I would give a Ar15 a chance. The 300blk came the closes to cal I like. Next month I turn 71 and would like it to be up and going for when this virus thing lets me back out to shoot.

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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
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LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check