02-05-2011, 19:03
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#1
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Guerrilla Chief
Join Date: Oct 2007
Location: Ft Benning
Posts: 707
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Quote:
Originally Posted by incarcerated
What bullet weight?
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I was looking for 55 grain but seems like there's more "deals" out there for 62.
I still consider myself a very novice shooter, hence the question: if I start using (or switch between the two weights) a 62 grain round, will my zero be off? This is for my personal rifle with an ACOG TA31-ECOS.
__________________
"I see that you notice that I wear glasses. Well, it was to be. I've not only grown old and gray, I've become almost blind in the service of my country." - General George Washington
"There are times in your life you'll be required to perform an exceedingly difficult task to the best of your ability, regardless of your perceived capability. Mental toughness is what will carry the day during these times. In other words, you suck it up and do what you have to do." - Razor
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lindy is offline
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02-05-2011, 19:17
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#2
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Auxiliary
Join Date: Nov 2009
Location: Alexandria, VA
Posts: 91
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Quote:
Originally Posted by lindy
... if I start using (or switch between the two weights) a 62 grain round, will my zero be off? ...
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Definitely, regardless of if the 62 has the steel penetrator or not. You will see a significant difference in POI, though not enough to take it off of the paper.
__________________
"Many current Army regulations and policies place insufficient emphasis on individual, crew, and unit marksmanship. If the fighting Army does nothing else, we must be able to hit our targets. Conversely, if we do all other things right, but fail to hit and kill targets, we shall lose."
--Army Vice Chief of Staff General John Vessey
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WholeManin2010 is offline
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02-05-2011, 20:08
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#4
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Quiet Professional
Join Date: Jan 2004
Location: Free Pineland
Posts: 24,821
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Quote:
Originally Posted by WholeManin2010
Definitely, regardless of if the 62 has the steel penetrator or not. You will see a significant difference in POI, though not enough to take it off of the paper.
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I disagree.
Do you have a lot of shooting experience?
As far as the OP asked, I was at a gunshow today. Ammunition prices seem to be relatively constant, with Federal 5.56 running $290-$310 per thousand.
I would expect further runs on semi-autos and high cap mags if additional gun control laws are introduced or enacted. Or if the POTUS issues Executive Orders restricting gun ownership further.
TR
__________________
"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - President Theodore Roosevelt, 1910
De Oppresso Liber 01/20/2025
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The Reaper is offline
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02-05-2011, 20:32
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#5
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Auxiliary
Join Date: Nov 2009
Location: Alexandria, VA
Posts: 91
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Quote:
Originally Posted by The Reaper
I disagree.
Do you have a lot of shooting experience?
TR
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I'm no expert, but I have been shooting for about 10 years. I've shot nearly 3,000 rounds of 55 and 62 gr in the past year, mostly to compare the worth of one versus the other for range training and plinking. My rifle was initially zeroed with the 55 grain, and when I loaded up the other stuff, it consistently impacted about 4 inches higher before I re-sighted. Have gotten pretty much identical results each time I've switched back and forth between the two.
__________________
"Many current Army regulations and policies place insufficient emphasis on individual, crew, and unit marksmanship. If the fighting Army does nothing else, we must be able to hit our targets. Conversely, if we do all other things right, but fail to hit and kill targets, we shall lose."
--Army Vice Chief of Staff General John Vessey
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WholeManin2010 is offline
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02-05-2011, 20:44
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#6
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Area Commander
Join Date: Feb 2009
Location: Clay House Stuttgart, Germany
Posts: 2,675
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Quote:
Originally Posted by WholeManin2010
I'm no expert, but I have been shooting for about 10 years. I've shot nearly 3,000 rounds of 55 and 62 gr in the past year, mostly to compare the worth of one versus the other for range training and plinking. My rifle was initially zeroed with the 55 grain, and when I loaded up the other stuff, it consistently impacted about 4 inches higher before I re-sighted. Have gotten pretty much identical results each time I've switched back and forth between the two.
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4 inches of difference at what range?
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mojaveman is offline
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02-05-2011, 23:15
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#7
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Auxiliary
Join Date: Nov 2009
Location: Alexandria, VA
Posts: 91
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Quote:
Originally Posted by mojaveman
4 inches of difference at what range?
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With both 25 and 100 yard zeros.
__________________
"Many current Army regulations and policies place insufficient emphasis on individual, crew, and unit marksmanship. If the fighting Army does nothing else, we must be able to hit our targets. Conversely, if we do all other things right, but fail to hit and kill targets, we shall lose."
--Army Vice Chief of Staff General John Vessey
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WholeManin2010 is offline
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02-06-2011, 09:41
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#8
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Quiet Professional
Join Date: Jan 2004
Location: Phoenix, AZ
Posts: 20,929
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Quote:
Originally Posted by WholeManin2010
With both 25 and 100 yard zeros.
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You might want to check your sights I'm betting they are loose...... 
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"The Spartans do not ask how many are the enemy, but where they are."
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Team Sergeant is offline
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02-05-2011, 20:32
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#9
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Area Commander
Join Date: Feb 2009
Location: Clay House Stuttgart, Germany
Posts: 2,675
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Quote:
Originally Posted by lindy
I was looking for 55 grain but seems like there's more "deals" out there for 62.
I still consider myself a very novice shooter, hence the question: if I start using (or switch between the two weights) a 62 grain round, will my zero be off? This is for my personal rifle with an ACOG TA31-ECOS.
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Fired through the same weapon I don't think you're going to notice a difference between M193 and M855 until 500 meters and beyond.
Last edited by mojaveman; 02-05-2011 at 20:57.
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mojaveman is offline
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02-05-2011, 20:44
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#10
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Quiet Professional
Join Date: Jan 2004
Location: Free Pineland
Posts: 24,821
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Quote:
Originally Posted by mojaveman
Fired through the same weapon I don't think you're going to notice a difference between M193 and M855 until 500 meters and beyond.
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I agree.
The drop differential between M193 and M855 is 0.1" at 100m., 0.3" at 200m., and 0.2" at 300m. You will not lose a center mass hit by using M193 hold for M855 ammo till well past 500m.
5.56 NATO Ball Ammunition Ballistic Comparison
based on Aberdeen Proving Ground Data
velocity (fps) trajectory (in.) drop (inches) drift (inches)*
range M193 M855 M193 M855 M193 M855 M193 M855
(meters)
0 3,200 3,100 -2.5 -2.5 0.0 0.0 0.0 0.0
100 2,774 2,751 +2.8 +4.4 -2.2 -2.3 1.3 1.1
200 2,374 2,420 +2.7 +5.8 -9.9 -10.2 5.8 4.9
300 2,012 2,115 -4.9 0.0 -25.1 -25.3 14.2 11.8
400 1,680 1,833 -23.0 -15.0 -50.8 -49.5 27.6 22.4
500 1,373 1,569 -56.2 -42.9 -91.6 -86.7 47.5 38.0
600 1,106 1,323 -113.1 -88.2 -156.1 -141.3 76.4 59.5
700 995 1,106 -206.8 -156.1 -257.3 -220.9 113.5 88.4
800 927 1,010 -339.9 -267.7 -398.0 -339.2 156.1 124.9
* Drift for 10 mph wind.
M193 Ball ammunition fired in M16A1 rifle with 250 meter battle sight zero.
M855 Ball ammunition fired in M16A2 rifle with 300 meter battle sight zero.
If you are getting a 4" difference at 100m., you are not getting full performance 5.56x45 NATO M193 and M855 ammunition.
TR
__________________
"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - President Theodore Roosevelt, 1910
De Oppresso Liber 01/20/2025
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The Reaper is offline
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02-06-2011, 09:31
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#11
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Guerrilla Chief
Join Date: Oct 2007
Location: Ft Benning
Posts: 707
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Quote:
Originally Posted by mojaveman
Fired through the same weapon I don't think you're going to notice a difference between M193 and M855 until 500 meters and beyond.
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500M! Oy! I guess that gives new meaning to "crisp front sight, fuzzy target".
Thanks for the info guys. Much appreciated. 
__________________
"I see that you notice that I wear glasses. Well, it was to be. I've not only grown old and gray, I've become almost blind in the service of my country." - General George Washington
"There are times in your life you'll be required to perform an exceedingly difficult task to the best of your ability, regardless of your perceived capability. Mental toughness is what will carry the day during these times. In other words, you suck it up and do what you have to do." - Razor
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lindy is offline
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