subsonic 450 bushmaster reloading data

Discussion in 'Reloading' started by whitetail regulator, Jul 28, 2018.

  1. whitetail regulator

    whitetail regulator Well-Known Member

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    i haven’t seen alot or data for 450bm subsonic loading so if u got some experience with this or simular please feel free to chime in...why 450bm subsonic? because 300blkout subsonic will kill deer with 194gr lehigh max expanders, but not leave much blood trail....5 shot 4 found all no blood....subsonic hunting is more like bow hunting in that your not really killing with shock....its wound channel...this means the game almost always runs when hit....so a blood trail is most desired for tracking....hopefully the 300gr xtp at 1050 will have better performance or exit wound...any experience with hunting with 300gr xtp regular please chime in....so
    starline brass 1.693
    trailboss 12.0gr
    cci#400 primer
    hornady xtp 300gr regular
    990fps avg
    detroit ammo has subsonic 450bm 300gr xtp mag it cronnyed 1018fps avg. this is from a ruger american ranch 450 bm bolt action.
    i think the xtp regular may expand better at subsonic velocity...ok chime in guys thanks...
     
  2. whitetail regulator

    whitetail regulator Well-Known Member

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    running a rarr through a aac 45 tirant subsonics only...
     
  3. whitetail regulator

    whitetail regulator Well-Known Member

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    fyi...i like the 450bm subs so much id like to do an arpistol in one...but not shure u can get it to cycle subs...anyone?
     
  4. whitetail regulator

    whitetail regulator Well-Known Member

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    i believe the twist on rarr is 1/16....the only 450 bm ar pistol barrel ive seen had a 1/24 twist, wich i suspect is too slow for big heavy subs...
     
  5. whitetail regulator

    whitetail regulator Well-Known Member

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    using the ti rant 45 on the rarr 450 bm requires a threaded adaptor 11/16x24 to .578x28 by excalaber...this gives u about 3/4” of adaptor with no rifings from muzzel to supressor...i was worried about stability on this...but everything seems stabilized with detroit subs...wiil see about handloads...
     
  6. Bravo 4

    Bravo 4 Well-Known Member

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    Are you having a conversation with yourself?
    Don’t worry I do it too, only mine sound more like this, “Why the [email protected] did you do that?!”....”because I’m a moron!” :D:D:D

    I mentioned to a buddy a little while back that I thought of building a .458 SOCOM pistol. So what does he do? Beats me to it, that’s a bad little dude!
    I wanted something small and light that I can hunt about anything with. Also to carry when I’m packing my big rifle into places. Normal I have my .460 Glock at my side but this would give me more reach. Can also shoot it subsonic suppressed. I use the Lehigh subsonic fracturing bullets in my little .510 and they have awesome terminal performance on game.
     
  7. whitetail regulator

    whitetail regulator Well-Known Member

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    sweet i really like the lehigh 194gr max expansion in .308 diameter....i haven’t seen an offering in .452 only .458 ....i wonder if it can be sized down...my guess probably not....any other. .452 hp low velocity expanding projectiles in the 300-400gr range?
     
  8. whitetail regulator

    whitetail regulator Well-Known Member

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    i would 458s pistol....but im a lil leary of running one through my tirant 45. a pistol can for .452 projectiles....anyone else running big bore subs through a tirant 45? subsonics only...
     
  9. J E Custom

    J E Custom Well-Known Member

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    I would think that the 250 grain FTX bullets would be good for expansion at Lower velocities. I know they are devastating at 450 loaded velocities (2200 to 2400 ft/sec)on hogs.

    I load them in my 460 S&W with great performance on everything.

    J E CUSTOM
     
  10. whitetail regulator

    whitetail regulator Well-Known Member

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    hmmm not shure i can get anything lighter than 300gr subsonic due to fill ratio....anybody try 230s subsonic in 450bm?
     
  11. Bravo 4

    Bravo 4 Well-Known Member

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    Sure you can, I’ve run 350 grainers sub out of my .510 cal. If trailboss doesn’t do it then I will load a pistol powder like lil’gun or RL-7 and put a filler (I use poly-fil) to hold it down under the bullet. Make sure you start above supersonic and work your way down in powder charge. If you plan on strictly subsonic then look at a lesser cartridge like the .45 ACP, lots of waisted space in the bigger .450 BM cartridge going sub.
     
  12. whitetail regulator

    whitetail regulator Well-Known Member

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    if someone manufactured a 45 acp bolt action or single shot id buy it in a flash...i may do an encore in 45acp but don’t know if it will have extractor that works or u gotta dig it out of the chamber
     
  13. whitetail regulator

    whitetail regulator Well-Known Member

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    for 45acp single shot i looked at
    encore barrel
    mouser conversion
    308 45acp conversion
    special interest arms novem 40 cal
    i wish i could just find a 45acp single shot carbine with threaded barrel from factory....suppressor host....anyone got a 45acp single shot carbine?
     
  14. Bravo 4

    Bravo 4 Well-Known Member

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    Ruger used to make a bolt gun in .45, don’t know if they still do. As you mentioned the .308, I’ve heard of guys cutting that brass down for .45 acp shotshells so don’t think extractors would be an issue. You could even build an AR upper with an adjustable gas block and turn it off. That would turn it into a bolt gun. Another option would be a single shot or bolt action .44 mag running subsonic. You can still run it through your can.
    Just throwing out ideas.
     
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