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Posted: 12/28/2013 2:56:01 AM EDT
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I have an ACOG TA11 with the donut of death on top of a S&W with a 14.5 perm barrel.
Originally I had it zeroed with 193 since I would shoot mostly 55 grain rounds and figured it would be around the same POI give or take. I have 1000 rounds of 855 stocked up for SHTF purposes, which I chose because it was what I used as a Marine, was satisfied with the performance on bad people and what I could afford at the time. Recently I started thinking if I should zero with 855 instead of 193. I heard they'll be close up to 200. Sadly I can't shoot further than that here. Since I mostly shoot 55 grain pills I wonder if I should stick with 193 zero, but the 855 is my "duty" ammo. Does it really matter or is one preferable? I'm not looking for cloverleaf accuracy. Also I am going to pick up some 60+ grain softpoints for hunting and self defense and think it'll be closer to 855. Of course, whichever I zero with I will see what the POI is for the other. I already read the Ammo Oracle and the tacked thread of ACOG zero. I only have access to a 50 yard range at the time (I live in St Cloud). Thanks. |
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Quoted:
I have an ACOG TA11 with the donut of death on top of a S&W with a 14.5 perm barrel. Originally I had it zeroed with 193 since I would shoot mostly 55 grain rounds and figured it would be around the same POI give or take. I have 1000 rounds of 855 stocked up for SHTF purposes, which I chose because it was what I used as a Marine, was satisfied with the performance on bad people and what I could afford at the time. Recently I started thinking if I should zero with 855 instead of 193. I heard they'll be close up to 200. Sadly I can't shoot further than that here. Since I mostly shoot 55 grain pills I wonder if I should stick with 193 zero, but the 855 is my "duty" ammo. Does it really matter or is one preferable? I'm not looking for cloverleaf accuracy. Also I am going to pick up some 60+ grain softpoints for hunting and self defense and think it'll be closer to 855. Of course, whichever I zero with I will see what the POI is for the other. I already read the Ammo Oracle and the tacked thread of ACOG zero. I only have access to a 50 yard range at the time (I live in St Cloud). Thanks. |
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You will be fine. TA11's were designed for a 55 grain M193 type out of a 20". As for the bullet drop compensator, the weight does not matter nor does the barrel length. Velocity does along with regards from height to bore.
You should probably explain yourself because this as-is, is meaningless. Bullet weight, shape and barrel length all affect velocity and they all affect the trajectory of the projectile, and as such the BDC. 
Trijicon so much in fact knows that different barrel lengths affect the BDC, that many models are barrel length specific. And hybrid models like the TA31f split the difference as illustrated in this pic. This is same ammo, bdc change is solely from different barrel length: 
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Quoted:
You should probably explain yourself because this as-is, is meaningless. Bullet weight, shape and barrel length all affect velocity and they all affect the trajectory of the projectile, and as such the BDC.
Trijicon so much in fact knows that different barrel lengths affect the BDC, that many models are barrel length specific. And hybrid models like the TA31f split the difference as illustrated in this pic. This is same ammo, bdc change is solely from different barrel length: http://i841.photobucket.com/albums/zz337/R0N_photos/ComparisonofTA31FandRCOreticles.jpg Quoted:
You will be fine. TA11's were designed for a 55 grain M193 type out of a 20". As for the bullet drop compensator, the weight does not matter nor does the barrel length. Velocity does along with regards from height to bore.
You should probably explain yourself because this as-is, is meaningless. Bullet weight, shape and barrel length all affect velocity and they all affect the trajectory of the projectile, and as such the BDC.
Trijicon so much in fact knows that different barrel lengths affect the BDC, that many models are barrel length specific. And hybrid models like the TA31f split the difference as illustrated in this pic. This is same ammo, bdc change is solely from different barrel length: http://i841.photobucket.com/albums/zz337/R0N_photos/ComparisonofTA31FandRCOreticles.jpg |
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I thought I understood that ACOGs reticles were based on a 62gr bullet at 28-2900 fps. The US military switched from 55 gr to 62gr before they adopted ACOGs. So what is the basis for the claim that ACOG reticles are based on M193 ammo? And more to the point, for the OP's stated situation and purposes, I would zero with M855. Plink with XM193 or 223 whatever, but if M855 is the SHTF ammo, that should be the zeroing priority. And its too bad so many people think M855 is great for SHTF because our military has used it so much. As civilians, we are more free to choose so many better options for SHTF. |
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Quoted:
I thought I understood that ACOGs reticles were based on a 62gr bullet at 28-2900 fps. The US military switched from 55 gr to 62gr before they adopted ACOGs. So what is the basis for the claim that ACOG reticles are based on M193 ammo? And more to the point, for the OP's stated situation and purposes, I would zero with M855. Plink with XM193 or 223 whatever, but if M855 is the SHTF ammo, that should be the zeroing priority. And its too bad so many people think M855 is great for SHTF because our military has used it so much. As civilians, we are more free to choose so many better options for SHTF. The Trijicon website states that the TA11 I have is based on 193 through a 20 inch barrel mounted on a carry handle. And yes I would have loved to have 5.56 in TSX, mk318, or even Fusion and at least 1000 rounds of it but I have other bills I have to pay and little money to do so. Like I said, I've seen what 855 does to people and find it adequate for my purposes. I am getting five mags worth of Fusion for self defense and until I get my career I'll make due with what I have experience with. |
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