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Posted: 6/11/2006 6:55:47 PM EDT
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Looking for the maximum effective range of a point target with M193 out of a 20'' 1/7 twist barrel. I would assume that it would be at least 600 meters with an ACOG (unless the bullet would spin apart.) I also understand that 1/7 favors the heavier load, but I have an abundance of 193 as well as 855. What does anyones first hand experience say. TIA 
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When you say effective range, do you mean to accurately hit a target, or to kill a living target reliably? If you assume that most military surplus is 2-3MOA ammo, and use 20" as the width of a human male target, then at 600yds you would stay within an 18" circle with 3MOA ammo. If you got a good 2MOA batch of XM193, then at 1000yds you could keep it in 20". ' |
If you had 2MOA M193 at 100 yard ammo you would never get 20" groups at 1000 yards. Sounds like someone is using theory and has not shot at long range. 
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You could have been a little nicer with that statement I believe. To correct someone is fine. No need to be a hard ass. -MEI 
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| I know about the limitations of ball ammo, and I know that the maximum effective range is a military term, and I also know that 200 yards/meters is about the max for fragmenting. I was looking for any insight whether the 55 grain bullet would spin apart with the faster twist or if accuracy would really start to wain after a couple hundred yards. heBulldawg_556 |
Nope, I prefer to waste haji up close. Obviously, I was speaking theoretically, and since "maximum effective range" is a theoretical term, I don't think that's a problem. Yes, the .mil says 550, but that's also pretty meaningless. In addition, what is "effective"? Yes, you certainly couldn't keep 20" groups at 1000 yards. But I bet you could hit the target in a reasonable number of shots if you were good enough. Is that effective or not? The term is loose. |
No, 55grain 193 Mil ammo will not spin apart at any range. Truth is even most lighter bullets will stay together with a 1/7 twist. I've shot plenty of varmint bullets in a 1/7 AR BBL and never had any go POOF in midflight. Can it happen? Probably. Is is something I worry about? Nope. The heavier bullets do work better at long range, and can be more accurate, out to 200 yards tho I'd bet it would be more the quality of the load then the weight of the bullet. I have 53 Match ammo and out to 200-300 yards I doubt a heavier bullet is any more accurate then they are. Get out there longer and the heavier bullets come into their own. I've seen 855 ammo that was pretty accurate, and I've seen some that was pretty bad. All depends on how well the penetrator is centered and balanced. If it's off, well, its not going to be accurate, period. |
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A couple of weeks ago I was shooting at a steel target 400 yards away. My Upper was a 20 inches long HBAR and 1-7 twist. The target is roughly 18 inches wide by 24(?) inches high. Using XM193 ammo I hit the target from a prone position with a bipod and Iron Sights: 4-10 and 7-10 I may try 500 yards some time in the future. PS: You should have seen the groups I kept getting at 300 yards. I kept putting patches upon patches that were on patches. 
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