5 56 NATO Ammunition: XM193 55gr. vs M855 62gr.

Big ChiefBig Chief Senior MemberPosts: 32,088 Senior Member

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  • horselipshorselips Senior Member Posts: 3,573 Senior Member
    Kinda bogus test. The two loads tested are so different in weight and construction that they can't be compared when  fired out of the same weapon. The 55 grain round should have been tested in a slower twist barrel (10" or slower) and the 62 grain load in a barrel with a faster twist (7"-9"). Results might have been different.  
  • horselipshorselips Senior Member Posts: 3,573 Senior Member
    Where the "H" is the edit button? I wanted to add to my post. Oh well. 

    I own a Saiga .223 Carbine which has a 10" twist rate, and an AR15 with a 7" twist rate. They both handle 55 and 62 grain loads differently. 
  • NNNN Senior Member Posts: 23,246 Senior Member
    Shooting at a 45 degree angle toward the ground it doesn't matter.
    This message has been deleted
  • SpkSpk Senior Member Posts: 1,395 Senior Member
    This is a test some of our own member can do in their backyards...............And do it better.
    "Facts are stubborn things and whatever may be our wishes, our inclinations, or the dictates of our passions, they cannot alter the state of the facts and evidence" — John Adams
  • BigslugBigslug Senior Member Posts: 6,697 Senior Member
    I think the M193 55 grainer is actually a more useful projectile:  you see, with the steel penetrator of the M855 62 grain bullet, there's actually more lead in the M193.

    By quick glance at the Hodgdon site, the powder charges for 55 grain loads seem to run about three grains heavier of powders with versatile burn rates like Varget or 4895.

    So when you start pulling bullets to melt down for casting and powder to re-use in cartridges that are socially significant, the M193 will be a more efficient use of your time. :D

    "Nothing is safe from stupid." - Zee
  • Gene LGene L Senior Member Posts: 9,645 Senior Member
    Put me down for the 55 gr. camp.  The steel penetrator core is a thing of the post-Viet Nam era, and maybe if you're trying to penetrate body armor, fine.  I admit my limited experience and prejudice is with the 55 gr bullet for which I have a fondness, and the lighter bullet is my fave.  I'm not even sure I am qualified to speak for the steel-core "penetrator" later rounds, although the 69 gr. jacketed rounds in a fast-twist barrel are quite accurate...which I have experienced.
    Not too many problems you can't fix
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  • shotgunshooter3shotgunshooter3 Senior Member Posts: 5,296 Senior Member
    I'm a 55gr fan. However, that's only because I buy in bulk and the 62gr steel core isn't allowed at a lot of plonking ranges. 
    - I am a rifleman with a poorly chosen screen name. -
    "It's far easier to start out learning to be precise and then speeding up, than it is having never "mastered" the weapon, and trying to be precise." - Dan C
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