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Posted: 10/5/2014 11:34:53 PM EST
So I was looking at the Black Hills website and the 62gr TSX load in 5.56 says 3,000 fps where the .223 offering (the only one I can find available) was listed as 3,100 fps. Do you think that is just because the .223 offering was shot with a 20" barrel as opposed to the 16" barrel used for the 5.56?

Do you think there is really much of a difference between the two offerings apart from the chambering? I couldn't find anything comparing the two apart from the bullet versus the "regular" tsx offering.
Link Posted: 10/6/2014 12:42:15 AM EST
The 62gr is the regular TSX you can buy anywhere. Only the 50gr is unique to BH.
Its the barrel length that creats the "slower" 5.56.
Link Posted: 10/6/2014 9:34:36 AM EST
[Last Edit: 10/6/2014 9:35:34 AM EST by LS1POWERED]
Your test barrel length theory is more than likely correct.
Link Posted: 10/6/2014 11:12:59 AM EST
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Originally Posted By LS1POWERED:
Your test barrel length theory is more than likely correct.
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Link Posted: 10/6/2014 1:44:59 PM EST
I posted this same question in another thread. it looks as if they use different bbl lengths for each test.

http://www.ar15.com/forums/t_3_16/654734_So_the_62gr_TSX_loaded_by_anyone_besides_black_hills_in_556_pressures_.html
Link Posted: 10/6/2014 8:28:38 PM EST
[Last Edit: 10/6/2014 8:29:53 PM EST by DustinS]
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Originally Posted By sheldonap90:
I posted this same question in another thread. it looks as if they use different bbl lengths for each test.

http://www.ar15.com/forums/t_3_16/654734_So_the_62gr_TSX_loaded_by_anyone_besides_black_hills_in_556_pressures_.html
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I was wondering how I never saw your post, then I seen the dates. I could only search and see posts less than 30 days ago (I don't have a paying membership). I apologize for starting a duplicate thread. I do want to say it is kind of interesting that they load both offerings to the same pressure. I mean even the ballistic gel tests they show are not that different (the 5.56 looked a little more rapid in expansion by 1/4").

Edit: forgot to add thank you for the replies (and the link to the other thread).
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