Primary Arms ACSS reticle: switching between 223 and 7x39 rifles?

[TheCoachZed]

Hi all,

Thought about posting this in optics, but figured it would be better-suited for the shooters here.

Thinking about getting a Primary Arms 3x prism, but could be using it on either a 5.56 or 7.62x39 rifle. So, not really sure which one to get.

Obviously the hold-over would be different but obviously you could figure out your ballistics and get your data for where the 5.56 hits for the various points on the X39 reticle, or vice versa. The 18-inch rangefinder marks should all be the same. So I presume the only *real* difference would be the windage/deflection shooting points in the reticle?

 

[greentips]

Theoretically yes for flat KD shooting. Any reticle can be made work that way

Practically no over 120 to 150m - too much velocity difference between the two, it does't work well.

 

[TheCoachZed]

Theoretically yes for flat KD shooting. Any reticle can be made work that way

Practically no over 120 to 150m - too much velocity difference between the two, it does't work well.

I eyed them up and there certainly is a lot of difference past ~150m. That's about as far as I want to shoot it anyway, but it seems a shame to waste all that extra capability..... they aren't that expensive anyway, so maybe the thing is just to buy both

 

[Tvw]

I eyed them up and there certainly is a lot of difference past ~150m. That's about as far as I want to shoot it anyway, but it seems a shame to waste all that extra capability..... they aren't that expensive anyway, so maybe the thing is just to buy both

Buy both

Devils advocate.. check out the Vector Optics Paragon line up. I have multiple of the 1x and a 3x. Glass clarity, FOV and eye box wise I choose them over the PA 100%.

 

[lawn gnome]

Can you use the reticle for one for the oter?
Yes.

There are some very good soviet bloc style optics that although designed for 7.62x39, like the PSO, POSP and PO series of scopes that have mounts specific for the AR flat top mounts. Their reticles are for the 7.62x39 but they are easily used for .223/5.56. These are the chevron style with three to four inverted "V" designs. They are good scopes, the reticles are not typically over cluttered and guys use them all the time.

In 7.62x39, the top "V" once zeroed for one hundred meters, lets the second and third "V" then be aligned for the two and three hundred meter points.

On a .223 rifle, again the top "V" is zeroed at the hindred meter point. However, given the difference in drop for the 5.56 round the second and third "V" will roughly match at ranges of four hundred and seven hundred meters. This assumes a standard twenty inch barrel length and the generic use of 55 gr weight.

So, honestly you use the chevron at one hundred and aim slightly above or off for two or three hundred.

Can you use a .223 scope reticle for 7.62x39?
Theoritically yes, but the chevron marks and counting down to the one you'll need are probably more problematic than helpful.