.50 BMG Subsonic bolt guns?

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Boostaholic
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.50 BMG Subsonic bolt guns?

Post by Boostaholic » Wed Jul 22, 2009 6:41 am

Who has messed with sub sonic BMG loads and what were the results?

I have a bolt action .50 BMG so cycling is not a issue.
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GHIVELY50BMG20MM
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Subsonic .50 BMG

Post by GHIVELY50BMG20MM » Sat Apr 03, 2010 11:49 pm

Hi everyone,my first post!!!

33.5grn of Red Dot, M-2 690grn horse pill at 952fps
Mcmillan Tac-50 29" pipe, 1-15 twist
Bullet Stability Calculation, 1.98 Bullet is maximally Stabilized.
I get 46fps of boost from AAC-CYCLOPS Total Velocity 998fps

Velocity x Velocity x Bullet Weight in Grains / 450240 = 1526ftlbs energy.

see video on YouTube "AAC 50"

Subsonic
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Post by Subsonic » Sun Apr 04, 2010 4:41 am

Nice rifle!! just got one question, you wrote here that you use 33,5 grns red dot but in the yt video you are saying that you use 43,5 grns of red dot, just wanted you to know..

GHIVELY50BMG20MM
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Post by GHIVELY50BMG20MM » Sun Apr 04, 2010 8:42 am

Thanks for bringing that to my attention, the video is incorrect about the charge weight. "Pharmuse" didn't correct my mistake, I told him I couldn't remember the exact load, after checking my notes I brought this to his attention.

Thanks again for keeping me on target.

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trey_phish83
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Post by trey_phish83 » Sun Apr 04, 2010 2:02 pm

i'd correct that video before someone looses an eye
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GHIVELY50BMG20MM
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Post by GHIVELY50BMG20MM » Sun Apr 04, 2010 2:26 pm

Pulled my reloading notes for 50bmg Red Dot


55gr 1392fps No signs of pressure
50gr 1307fps
45gr 1225fps
40gr 1163fps
35gr 1008fps
30gr 830fps Did not seal neck
33.5gr 952fps Neck has good seal

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jimmym40a2
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Post by jimmym40a2 » Tue Apr 13, 2010 1:25 pm

great info thanks
http://www.youtube.com/watch?v=nEZJ_C4LwzA

vipergts
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Re:

Post by vipergts » Sun Sep 12, 2010 2:16 am

GHIVELY50BMG20MM wrote:Pulled my reloading notes for 50bmg Red Dot


55gr 1392fps No signs of pressure
50gr 1307fps
45gr 1225fps
40gr 1163fps
35gr 1008fps
30gr 830fps Did not seal neck
33.5gr 952fps Neck has good seal
I have a McMillan 50 and just picked up a .50 reloading setup. Few newbie questions:
1)Did you crimp case after seating bullet?
2)What was the case powder volume with that load(33.5gr)(ie. 30% or more etc.)?
3)Any flash hole modifications(over sizing)?
4)Powder selection reason? Tried any other powders with any success?
5)Bullet selection reason(Tried any others)?

THX!

Great video!!!

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Re: .50 BMG Subsonic bolt guns?

Post by paper9 » Sun Mar 13, 2016 4:57 pm

22 inch barrel, bolt, 1- 15 twist, CCI-35 primers
647 gr Barnes TAC-X, #30695. OAL - 5.205.

Trail Boss 44 Grains, 22 round sample
V average 1024
V max 1045
V min 1005

Red Dot 38 Grains, 10 round sample
V average 1030
V max 1055
V min 1015

At 100 yards I am getting key holes, but JBM stability indicates greater than 2 for stability.
Does the JBM number indicate more stable the higher the number or is around 2 - 3 optimal?

Definite key holes with both of the above loads with Trail Boss at 45 gr and Red Dot at 39 gr.
Last edited by paper9 on Wed Mar 16, 2016 9:01 pm, edited 2 times in total.

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T-Rex
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Re: .50 BMG Subsonic bolt guns?

Post by T-Rex » Sun Mar 13, 2016 5:30 pm

If any of you guys are near CT, I have about 18lbs of Red Dot I'd like to get rid of.
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Re: .50 BMG Subsonic bolt guns?

Post by Zero99z » Sat May 30, 2020 8:58 pm

I'm a little late on this one, but what powders will work? Red dot is shot she'll powder right? Would hodgdon work?

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