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Thread: Your 300 AAC loads?

  1. #1
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    Your 300 AAC loads?

    I would really appreciate hearing what you are using for 300 Blackout, why and your results.
    Please include everything you think may be pertinent. Barrel length, gas system length, velocity, powder type, specific bullet and expansion of or lack of, etc.
    Benny

    223 Rem, 7mm Rem Mag, 30 Carbine, 300 AAC, 30-30 Win, 308 Win, 30-06 Spr, 303 Brit, 45-70 Govt.
    32 S&W Long, 38 Spl, 357 Mag, 44 Spl, 44 Rem Mag, 45 ACP, 45 Colt.

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    My very first batch.
    I was trying to use powder I had on hand.
    12.0gr of 2400 and 150gr Remington PSPCL retreived from a sand/clay media fired from about 40 feet.
    Penetration was about 12".
    16" barrel pistol length system.
    Got one reading from the chronograph that session of 1551fps.
    I have no idea why one is almost perfect.
    2017-03-04 17.40.20.jpg
    Benny

    223 Rem, 7mm Rem Mag, 30 Carbine, 300 AAC, 30-30 Win, 308 Win, 30-06 Spr, 303 Brit, 45-70 Govt.
    32 S&W Long, 38 Spl, 357 Mag, 44 Spl, 44 Rem Mag, 45 ACP, 45 Colt.

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    I use Lil Gun, H110, H108, 296 and 1680. 2400 should be good. What is the COL for your load?

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    Benny

    223 Rem, 7mm Rem Mag, 30 Carbine, 300 AAC, 30-30 Win, 308 Win, 30-06 Spr, 303 Brit, 45-70 Govt.
    32 S&W Long, 38 Spl, 357 Mag, 44 Spl, 44 Rem Mag, 45 ACP, 45 Colt.

  5. #5
    Senior Member SafetyJoe's Avatar
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    I've tried several different powders and bullets, but the one I've tested the most is the cast lead and powder coated 133 grain lyman 311410 bullet using 17.2 grains of IMR 4227. From a 16 inch barrel I get 2000 fps and under 1 inch groups at 50 yds.

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    My rifle is a 10.5", pistol length gas system, standard buffer and extra power buffer spring. I can't speak of expansion because I'm not a hunter. My main powders are lil'gun and IMR4227, I'll try to run down some of the loads I use and have used in the past.

    All loads use CCI small rifle primers
    150gr hornady FMJBT or nosler ballistic silvertip
    16.8gr lil'gun
    Seated to cannelure on hornady, unsure of oal but roughly the same on the ballistic silvertip
    Right around 1910fps on the silvertip, hornady should be close, haven't shot them over the chrono yet.

    125gr Speer TNT
    18.8gr lil'gun
    2.070"
    2150fps

    240gr majestic cast/powder coated flat point
    9.7gr IMR4227
    2.230"
    1020fps, cycled fine

    155gr heavy plated spitzer-got em cheap, loaded me as cheap as possible
    14.3gr lil'gun
    Seated to what qualifies as a cannelure
    1700fps, cycles fine on warm days, doesn't lock back on empty on cold days (under 30 degrees)
    Great to blast through, not the most accurate though, but they were less than $23/100rounds loaded.

  7. #7
    Member DaveL's Avatar
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    I posted this on the thread below, "How Many Grains of Trail Boss....". So I thought I would repost it here for you.

    I've tried 5 different powders for subs. 220gr Nosler BTHPM and 10.9grs. of 1680 turned out to be the best load by far. Consistent SDs and primers, consistent velocity, and great accuracy.

    The worst was Lil'gun. Big swings in SD, some primers looking like they were just inserted (except the firing pin divot) and some looking like an overcharge (flat. I mean really flat).

    All loads were individually weighed using my Ohaus M5 beam scale and LC converted brass.

    Trail boss will not cycle my carbine. TB has it's nitch but not in this application.
    IMR4198 and H110 worked OK but 1680 was noticeably more accurate.

    For plinking loads I tried several different powders and I settled on 150gr Sierra FMJBT Gamekings with 17 grs of H110. It's a very accurate load.

    For Whitetail hunting I settled on Nosler 125 gr Ballistic tip Spitzers with 21.5grs of 1680.

    Dave

  8. #8
    Senior Member WarEagleEd's Avatar
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    I haven't loaded a lot for .300 Blackout and only shot a few of my reloads once, so my data is limited. I'm currently using Hodgdon Lil' Gun because that was all I could find at the time. I did come across some H110 at some point, but have yet to use it. Ideally, I would like to use Accurate 1680 because I hear good things about it in .300 BLK and I can use it in 7.62 X 39, too. However I haven't had any luck finding it in local stores and I hardly ever make it to gun shows to look for powder because they always seem to be on weekends that I have to work. That being said, here is the very limited data from one small batch of reloads.

    Case = Hornady
    Primer = TulAmmo KVB-223
    Powder = Lil' Gun (14.7 grains, starting load for this powder per the Hornady manual, 9th edition)
    Bullet = Hornady SST, 125 grain
    COAL = 2.100"
    Average velocity = 2050 fps (Hornady manual stated this powder charge would be good for about 1700 fps, but they used Winchester small rifle primers. Maybe this made a difference?)
    Barrel length = 16"
    Gas system = carbine length

    I only chronographed 5 rounds. The first four rounds had an extreme spread (ES) of 32. The last round was only 1972 fps and pushed my ES to 117 and my standard deviation 45.

    I have some more reloads waiting to be shot and chronographed, but I need to replace the front brakes on my truck before I can make it back to the range. I don't think my car can make it back there, not enough ground clearance.

    Ed

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    I was using 110 grain bullets, and Win 296.

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    So far this is what I've tested for velocity and function.

    6.5gr of Trail Boss with 150gr PSPCL averaged 850fps, as expected it did not cycle the action.

    12.0gr of 2400 with 150gr PSPCL averaged 1530fps.

    13.0gr of 2400 with 150gr PSPCL averaged 1650fps.

    14.5gr of 2400 with 135gr Sierra #2124 averaged 1870fps.
    Benny

    223 Rem, 7mm Rem Mag, 30 Carbine, 300 AAC, 30-30 Win, 308 Win, 30-06 Spr, 303 Brit, 45-70 Govt.
    32 S&W Long, 38 Spl, 357 Mag, 44 Spl, 44 Rem Mag, 45 ACP, 45 Colt.

  11. #11
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    My thin g is I don't have a sound suppressor on my rifle, so I see no need to go big and subsonic. I have tried a few 150 grain bullets but they seem just a bit too long. I stuck to like 110 grain bullets. More velocity.

  12. #12
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    I like to load them cheap. Preferably under $25/100. That's usually 150gr fmj or 155gr plated.

  13. #13
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    A couple of more today.

    20.0gr of AA1680 with 135gr Sierra #2124 averaged 1940fps and a little less than 1" groups at 50 yards.

    19.0gr of AA1680 with 150gr Rem. PSPCL averaged 1870fps and a little less than 1" groups at 50 yards.
    Benny

    223 Rem, 7mm Rem Mag, 30 Carbine, 300 AAC, 30-30 Win, 308 Win, 30-06 Spr, 303 Brit, 45-70 Govt.
    32 S&W Long, 38 Spl, 357 Mag, 44 Spl, 44 Rem Mag, 45 ACP, 45 Colt.

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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