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Posted: 7/1/2013 9:22:21 AM EDT
| Which is more accurate and better to shoot out of an AR15 A2 20" HBAR 1-9 twist. |
Welcome to the board, fellow Hoosier. 
I agree with Combat_Jack. This might help: http://www.ar15.com/ammo/project/perf_poi.html Also, read The Ammo Oracle. |
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Quoted:
I would say neither is what you would call accurate, as both will be in the 3" +/- range for a 10 shot groups at 100yds. Agreed. Both are pretty nasty. Some of the IMI M855 has shot decent for me.... but accuracy and those two options don't go together at all. For a 1/9, I'd try 69 gr SMKs... and maybe even some 77s. We have a 1/9 5R that loves 77 gr SMKs. |
| I would say M193 is likelier to be more accurate than M855. However, I really find that it comes down the barrel. For some reason my Noveske Afghan barrel shoots M855 significantly better then M193. My Rainer Arms barrel does better with M193. My FN barrel doesn't really show any difference. For SHTF scenarios I'll take M855 for it's penetration. However, I wouldn't loss any sleep if I was stuck with M193. These are combat accurate load that will do the job if you do yours. Anything outside 300yds I'll take MK262 Mod 1. |
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Quoted:
Both M193 and M855 have military required minimum accuracy of about 4MOA, though the stuff is usually quite a bit better than that. Some people have noted issues with M855 at longer ranges. Neither is "sniper ammo," if you know what I mean. This. Both rounds are meant for hitting a person, not driving tacks. If that is what you are wanting to do pick up some match ammo. |
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Both of the mil spec loadings will shoot approximately the same. The spec calls for something like 3.5 - 4" groups at 100 yards and that's consistent with my own experience.
But I don't shoot any of the factory ammo any more. It's very possible to hand load an M193 equivalent using a higher quality 55 grain FMJ-BT bullet such as the ones made by Hornady and Sierra and tighten the groups up a lot at the same mil spec velocity of 3,250fps; figure 1.5" groups at 100 yards. But with a hand loaded M855 equivalent you're out of luck because the "problem" is the SS109 bullet itself. Being a composite bullet, it just won't fly very straight. It doesn't have the balance, the ballistic stability in flight. Hand loaded M855 is a challenge to get it to match factory performance...but with work, it CAN be done. I've put a good bit of personal work into this little project myself and I have only been able to match factory performance. IOW, factory M855 is very good for what it is, considering its built-in limitations. |
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