I have a dumb question that's Trijicon related but since there is no such forum on ARF I'm asking here because there's a lot of military people.  

Ok, so my sis and I both have ACOG's on our AR's but we have different ones.  Her's is the standard 4x32 (TA31F-RMR) with the red chevron.  It says it's bullet drop compensation is designed for shooting out to 800 meters without any adjustment.  My ACOG is TA11J-RMR 3.5x35 with the red illuminated cross hair (definitely better IMO) and it's bullet drop compensation is designed to go 1000 meters without adjustment.

I understand the 3.5x35 gives a wider field of view (I prefer it over the 4x32) but why is my 3.5x35 TA11J-RMR designed to shoot 1000 meters and her 4x32 TA31F-RMR, which has a slight stronger magnification, designed to shoot 800 meters?  Others I've seen are designed to shoot 600 meters...

Why is my 3.5x35 designed to shoot 1000 meters while others with more magnification have 600 and 800 meter BDC's?  It's seems strange to my non-informed brain.  Maybe you guys that have used them for military purposes could shed some light on it.

OK I have not used either one, I have looked through both though.  It all has to do with the distance of the tic marks in the recticle.  Also each of the ACOG's are rated at a certain distance IF and that is a big IF, you are using the same load (5.56 vs .223, 55 grain bullet vs 62 grain bullet, not sure what load they are based on) at the same temperature, same elevation, ect.  But basically its all in the distance in the tic marks that they made into the scope.  If you change your load (say 77gr OTM, Mk262 bullet) it won't impact at the exact tic mark for the range you have selected, if the scope was set up for a 55 gr XM193 round, even worse if it was based on a 55 gr .223 round.  Hope this makes sense, I tried to explain it the easiest I know how.

I think her question was more about why a 4x optic which would allow you to see and aim better at longer range would have a BDC designed for a shorter range than a 3.5x optic.  I have to admit, I'm curious, too.

^-this

OK my bad.  Dumb question dumber answer.  Actually that is a good question, I dunno, you'd have to ask Trijicon I guess.  Makes sense now that you put it that way.  Sorry I couldn't help.

lol, hey you tried, that at least gets your macaroni art on the fridge

TY!  

Maybe it's because that with the lower magnification that there is more visible "area" within the scope that will allow for holdovers at 1k.

I know in my TA31 that there's not much more room to put a 900 and 1k hash marks before hitting the edge of the FOV. Optics are generally less accurate at their extreme edges too

That could be correct.  I've not used the Trijicons so I'm not sure what their fov is.  But I wouldn't think that relatively low power like 3.5 - 4 would have such a narrow fov that that would be the reason.  Maybe it is.