Zeroing .308 ACOG w 147 gr ammo

[timbo399]

I recently bought a SCAR 17 and an ACOG TA11 for it (3.5x .308 green Chevron reticle model). Up to now, I have only used irons on my AR15's and M1A over the years but as I get older my eye sight is getting worse and liked the idea of the ACOG.
My intended use is not tight group type shooting (I recently bought a Rem 700 AAC and still figuring out scope to buy for it as long range shooting is all new to me)- but Rem 700 rig once finished will be my "precision" rifle and I have 1,000 rounds of FGMM 168 gr for it and look forward to taking some precision rifle classes in the future (reloading is not an option for me for various reasons).

Back to my intended use for new SCAR w TA11 ACOG- I simply enjoy hitting the steel plates at Angeles range with my AR15's and M1A Scout with my irons but with my eye sight these days my limit is 300m to consistently ring the steel plates.
All I want to do with SCAR is have it as a range toy and use the BDC and 3.5x magnification to stretch out to 400-500m plates. However, I plan on using strictly 147 gr milsurp for the SCAR as I have a large quantity of this I have been buying over the years whenever I find good prices for quality milsurp. For zeroing the TA11, will a 100m zero keep the BDC estimates on the reticles at least close enough to hit 10" steel plates out to 500m? Does anyone out here use their ACOGs w 147gr milsurp? Reason I am asking is the downside I see on ACOG is the BDC is calibrated for a specific load and just wondering if I would be WAY off with a 147 gr zero out of the SCAR 17 16" barrel. Thank you for your input.
btw, I've seen some pics of our troops using SCAR 17's with the 4x ACOG and assume they are using 147 gr m80 Ball so can't be that far off can it? Thanks! This scope stuff is all new to me after years of just using irons.

[Droppin Deuces]

Supposed to zero the point at 100, but I have always just zeroed(the sight) it as far out as I could see. If you zero the point at 100, there is no guarantee it will hit on the hash at 500. However, if you zero the 500m hash for your 10" plates, it will still be "close enough for government work" at 100 and beyond.

When shooting with an ACOG zeroed at 100, I expect it to be spot-on at 100-300, but anything outside of that I only expect it to be "minute-of-man" accurate since that's really all it's meant for.

[Droppin Deuces]

The issue you're going to have at 500m is that each click is 2.5". So even if you have yourself a 1MOA finger, you're likely to miss your 10" plate a good 1/3 of the time. Or something like that.

[Porschegt2]

plus i bet its damn close to zeroed outta the box

[goodlookin1]

Pretty sure that the ACOG's are BDC'd using the 147's like the Military uses.

Not sure of your barrel length as that will make a difference, but at 500 yards, you wont be that far off. Best bet is to simply shoot out to 500 and see what happens.

[timbo399]

Thank you all for your replies. You guys are always very helpful. I did a bit more research online and looks like majority of ACOGs (if not all) w 308 reticle are calibrated for 168 gr out of a 20" barrel. However, I ran across a post on AR15.com where a guy ran through all the ballistics numbers, etc for 168 gr out of 20" barrel vs 147 gr Nato out of 16" barrel and POI's were very similar. So I feel confident that given I have a 16" barrel SCAR it will not be THAT far off. Again, not looking for extreme precision here, that's not intention of an ACOG, but feel good about my reticle choice now given ballistics data have seen some people posting on other forums with the same question I had. I could share the ballistics data if anyone interested. Also, read some posts where guys bought .223 ACOGs for their 308 rifles since the data they ran for their 308 rig they were putting it on w the load they planned to use were actually very similar to the .223 ballistics the ACOG BDC is based on. But like I said, I'm confident w my TA11 308 BDC purchase for my 16" barrel w 147 gr Nato as seems to fit the reticle. The lower velocity from the shorter barrel makes up for the lighter round I will be using.

Now I just need to figure out a scope for my Rem 700 AAC and get into the world of longer range precision shooting- have a bunch of FGMM 168 gr for that. Should be fun although, damn, I though picking rifles could make your head explode w all the options out there, the world of scopes is a whole new ball game, so many options and so many opinions. Guess main thing for me , being a newb to scopes and longer range precision shooting, is going w mil/mil or moa/moa (like the idea of moa/moa better since the math is easier in my head but seems like more options for available for Mil/Mil), and also plan to go with FFP. Price point is $600-$800. From quick research I have done it seems SWFA SS could be a good option, I like the idea of keeping it light- scopes under 25 oz. Not looking to shoot past 800m so 12-15x should probably be enough magnification I would think. Or I could just get a scope for my SCAR and interchange w ACOG when want to be more precise and sell Rem 700 that is BNIB and save some money. But everyone should have a bolt gun shouldn't they??!Thanks