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300 Blackout?

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  • FrommerStop

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    I'll give ya some 150gn projectiles if you wanna play with them and report back. LMK and I'll drop them off to ya.

    That is a most kind offer, but I also have a lot of pulled military 150 grain .30 caliber bullets and even frangible I got from another member here to try. If you have pulled .30 Caliber carbine fmy 110's I would like to try those out for sure.
    I am thinking of real heavy bullets with lighter powder charges that are a little above supersonic. I am thinking of 220 grain HP at 1200-1300 fps. That is a midrange .44 mag load with light fast burning powder with a directional muzzle break to mitigate extreme muzzle blast.
     

    kidsoncoffee

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    That is a most kind offer, but I also have a lot of pulled military 150 grain .30 caliber bullets and even frangible I got from another member here to try. If you have pulled .30 Caliber carbine fmy 110's I would like to try those out for sure.
    I am thinking of real heavy bullets with lighter powder charges that are a little above supersonic. I am thinking of 220 grain HP at 1200-1300 fps. That is a midrange .44 mag load with light fast burning powder with a directional muzzle break to mitigate extreme muzzle blast.

    I wish I had some 110s. I can't find any cheap enough for my liking. Let me know how the 150s do for you and by all means share the recipes. I'll share mine as well with ya. I don't have a chronograph but I can go off 50ya and 100yd accuracy. What twist barrel is your 10.5"? Mines 1:10.
     

    FrommerStop

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    I wish I had some 110s. I can't find any cheap enough for my liking. Let me know how the 150s do for you and by all means share the recipes. I'll share mine as well with ya. I don't have a chronograph but I can go off 50ya and 100yd accuracy. What twist barrel is your 10.5"? Mines 1:10.

    Mine: said to have a 1 in 7 inch twists for 10.5 inch upper and I just got a 7.5 inch with 1 in 8 twist. A one in 10 should be fine for 150 30 cal bullets. Strange in a 30-06 1 in 10 is good for a 220 wt, but people want a faster twist for similar bullets and also longer in 300 blackout /whisper cartridges. The whisper was originally meant by Jones of SSK industries to fire if IIRC pointed and long like 240 projectiles and hence the much faster twists.

    Whispers®: A wide range of calibers encompass the ‘Whisper®’ series of cartridges. A “Whisper®” cartridge must be capable of sub-sonic extreme accuracy with very heavy bullets for its caliber; i.e. 240 grains in 30, as well as moderate to high velocity while maintaining excellent accuracy with light bullets for the caliber; i.e. 125 at 2300 FPS in 30. The 300 Whisper® https://sskindustries.com/300-whisper/
    The SSK whisper is a trade marked proprietary cartridge and 300 blackout is a SAMMI designated cartridge that is not trademarked and very closed to the whisper in measurements. The man in charge of these developments was JD Jones and not to be confused with JD Johnson of the American Bull Breed.
    800px-JD_Jones.jpg


    Slow motion 10 shot burst from a M16 300 Whisper®
     

    SAWMAN

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    Plainly . . . a 300BLK with a 1:10 twist is FUBAR . . 6 is primo . . 7 is best . . 8 is simi ok . . 10 is . . well . . . .
    The 308 and 30-06 will shoot the heavier/longer bullets because of speed.
    The shorter bbl 300BLK's with the 1:10 bbls will be "iffy" with the 150's (speed). The 165's and heavier will be a no-go. AND . . . bring up the stabilization chart before trying even a 150 "no lead" style. --- SAWMAN
     

    mtbbrewer74

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    My 300 Blackout pistol has 9.5 inch barrel with a 1:7 twist.

    Sent from my SM-G955U using Tapatalk
     

    FrommerStop

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    Plainly . . . a 300BLK with a 1:10 twist is FUBAR . . 6 is primo . . 7 is best . . 8 is simi ok . . 10 is . . well . . . .
    The 308 and 30-06 will shoot the heavier/longer bullets because of speed.
    The shorter bbl 300BLK's with the 1:10 bbls will be "iffy" with the 150's (speed). The 165's and heavier will be a no-go. AND . . . bring up the stabilization chart before trying even a 150 "no lead" style. --- SAWMAN
    At close range than the 150 pointed fmj ball might trumble upon striking flesh and make a nice messy wound. I did not know they made 1 in 6. That sounds really like a fast twist.
     

    Little Jack

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    Sig does their long barrelled MCX 300 in 1/6. Short barrels in 1/5. I've seen a couple complaints(might have been the same guy on different sites) about them over spinning and bullets coming apart.
     

    SAWMAN

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    As Nate stated above - -> 6,and 5 for short. There ya go.
    Shorter the bbl,the less vel,faster the twist for stability.
    For me,even shooting the 110's super,7 is OK,but I would still opt for a 6. --- SAWMAN
     

    FrommerStop

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    Sig does their long barrelled MCX 300 in 1/6. Short barrels in 1/5. I've seen a couple complaints(might have been the same guy on different sites) about them over spinning and bullets coming apart.

    One in five. They next need to do progressive twists. Spinning the bullets faster should help the slow sub-sonics expand better one would think. I have heard of the 22-250 and 220 S cause thin jacketed bullets to disintegrate in flight.

    Well I have what I have and if it will do 3 moa I will be happy. Good enough for head shots at a 100 yds and if I am up to it even 200 yards. I do not have a whole lot of money invested in these uppers and basically these are self defense guns and not intended for hunting. Good for use in and around vehicles, can penetrate soft armor and car bodies, and not so hard to hide under a jacket.
     

    Baddog 0302

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    Plainly . . . a 300BLK with a 1:10 twist is FUBAR . . 6 is primo . . 7 is best . . 8 is simi ok . . 10 is . . well . . . .
    The 308 and 30-06 will shoot the heavier/longer bullets because of speed.
    The shorter bbl 300BLK's with the 1:10 bbls will be "iffy" with the 150's (speed). The 165's and heavier will be a no-go. AND . . . bring up the stabilization chart before trying even a 150 "no lead" style. --- SAWMAN

    Then why are all the 10" 30 Cal. Contender Bbl's with 1-10 T able to hit a IHMSA & NRA LR chickens with about a 3.5" body at 200 Yds./meters. That is in the hands of excellent shooters . I used to shoot M-2's * out of a 10" 1-10 T 30-20 [32-20 with a .308 bore] Contender and hit full size rams at 200 yds. and this was my standing load and I'm guessing it was in the 1100 FPS range, about the same speed for a 165 BTSP that was my "big match" "ram load"
     

    FrommerStop

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    Then why are all the 10" 30 Cal. Contender Bbl's with 1-10 T able to hit a IHMSA & NRA LR chickens with about a 3.5" body at 200 Yds./meters. That is in the hands of excellent shooters . I used to shoot M-2's * out of a 10" 1-10 T 30-20 [32-20 with a .308 bore] Contender and hit full size rams at 200 yds. and this was my standing load and I'm guessing it was in the 1100 FPS range, about the same speed for a 165 BTSP that was my "big match" "ram load"

    Interesting. Some of those loads sound like what the old 32-40 shot and would do and I wonder what twist it used.
     

    Baddog 0302

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    Interesting. Some of those loads sound like what the old 32-40 shot and would do and I wonder what twist it used.

    The 30-20 AKA 32-20 has within 1 Gn, the case capacity of the BO , The 32-40 looks a lot like a 30-30 and probably has about the same capacity
     

    FrommerStop

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    The 30-20 AKA 32-20 has within 1 Gn, the case capacity of the BO , The 32-40 looks a lot like a 30-30 and probably has about the same capacity

    The 40 I think means 40 grains of black powder. The 32-20 meant 20 grains of black powder. But I think the velocities of the old 32-40 loads being at lower pressures were less than than what the 30-30 could do that was likely america's first commercial smokeless rifle cartridge.
     

    FrommerStop

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    I just tried my new 7.5" BCA cheapo 300 blkout upper under the house for function and with some re-manufactured firing 150 fmj bullets for three rounds getting function perfect. I had to switch out the bolts first . This the second BCA upper I have gotten that required another manufacture's bolt to function due to insufficient head space. It would just accept some factory ammo that I had, but barely, and the other ammo had throat marks on the projectiles and took some force to extract from the gun. New bolt and all seems good. Gas system seems to have good power and this is with an H3 heavy buffer. I prefer the heavy buffers since they slow the speed of the bolt. Give better feeding, gives more time for pressures to go down and over all likely easier on the extractor.
    Just ordered a cheapo optic for it from palmetto. Uses a stupid battery size I never heard of. It is a sig saur. Picture is from optics planet. Their charge was slightly more and in green. comes with a mount, free shipping and no tax.
    opplanet-sig-sauer-romeo-msr-compact-green-dot-sight-1x20mm-2-moa-green-dot-1-0-moa-adj-m1913-black-sor72002-main.jpg

    Sig Sauer Romeo-Msr Compact red Dot Sight, 1X20Mm, 2 Moa red Dot, 1.0 Moa Adj, M1913, Black, SOR72002
     
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    FrommerStop

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    Sorry to hear your BCA is giving you grief. I've got two shoot great no issues. I think the bushnel trs-25 is the best bang for the buck.

    The bolt exchange fixed them.
    I had been using the lower priced primary red dot that is a cheap knock off of the smaller aim point after the AK operators union used them in some grueling testing while putting 1,000's of rounds through AKs.

     
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    mtbbrewer74

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    Sent from my SM-G955U using Tapatalk
     

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