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Posted: 7/6/2015 5:33:03 PM EDT
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I have a TA31F and the bullet drop compensator is based on the ACOG being sighted in at 100yds. I would like to put it on a 10.5" upper, but with the drop in FPS, how much will that effect the bullet drop compensator at 200, 300, 400, 500 yds?
I know it says it goes out to 800, but with a 10.5" barrel it would just drop too much, so I'd just like to know how it would be different at 200 to 500yds and how I would read/ use the ACOG reticle properly with this upper. |
| It works just about perfectly when I have it setup on my 16" upper, but Id like to put it on my 10.5" and I'm curious how close the reticle will be at say 200 and 300 yd mark on the reticle. will it be "close enough" or should I use the 300 drop point for 200 and 400 for 300? Maybe even the 500 mark for 300? I'd like to know if there is an easy way to use this high dollar sight for the 10.5 or will it just have to like on the 16". |
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TA31RCO-M4
FROM TIP OF CHEVRON TO: BOTTOM OF THE CHEVRON 5 MOA 1ST HASHMARK (400M) 9 MOA 2ND HASHMARK 14 MOA 3RD HASHMARK (600M) 20 MOA 4TH HASHMARK 28 MOA 5TH HASHMARK 38 MOA Should be very close to these numbers, use a ballistic calculator to figure out the ranges. You will need muzzle velocity and bullets ballistic coefficient. Alternatively, after zeroing, shoot a target at 100 yds using each different stadia line and then measure the distance it is off your point of aim. Again use a ballistic calculator to determine what each stadia line represents in term of yardage based on the difference in MOA. You will still need the actual mv and bc. Hope that helps some. |
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I'm really looking to know from zero to 300. If I zero the 10.5 to be the tip of the chevron at 100, what would 150 200 and 300 be out of the 10.5" barrel with 55gr ammo?
what I'm kind of asking is if I zero it for the 100yd at the tip of the chevron, will the drop compensator be basically useless? like the bottom of the chevron, and the 300 400 500 600 800 marks. I'm trying my best to ask this question but It is hard to describe. thank you for everyone's help and helping me try to find out how to best use this badass optic on top of my SBR. |
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It's trial and error really when you deviate what it was made for. However, it is not going to be off by THAT much. We're talking at some distance it's going to not be correct but before that it's going to deviate by a little until it goes way off.
Think of it like being off by a little on your sights. As the distance increases, the deviation increases. I put my TA31ECOS on a M1A and found the M80 round has similar ballistics. At about 400m the offset becomes noticeably apparent. You don't need science really, just go out and do it. It will be off, but by how much? Only you can test it. |
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Quoted:
TA31RCO-M4 FROM TIP OF CHEVRON TO: BOTTOM OF THE CHEVRON 5 MOA 1ST HASHMARK (400M) 9 MOA 2ND HASHMARK 14 MOA 3RD HASHMARK (600M) 20 MOA 4TH HASHMARK 28 MOA 5TH HASHMARK 38 MOA Should be very close to these numbers, use a ballistic calculator to figure out the ranges. You will need muzzle velocity and bullets ballistic coefficient. Alternatively, after zeroing, shoot a target at 100 yds using each different stadia line and then measure the distance it is off your point of aim. Again use a ballistic calculator to determine what each stadia line represents in term of yardage based on the difference in MOA. You will still need the actual mv and bc. Hope that helps some. 
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