Ptr91 & mpbr

[The_Armed_Therapist]

Hello, all,

I'm going to be taking out my PTR91 to sight it in soon and was wondering what is the best way to go about this. Should I sight it in for Maximum Point Blank Range? If so, what is the MPBR for the PTR91? Should I just go by the ammo that I'm shooting or does the rifle play a big part as well?

If not sighting it in based on MPBR, then what is the best method? Technically, if I have it zeroed at 50 yards, does that mean it's also zeroed at 300ish yards? Anyone have the correct numbers on this? I'm just a little lost as far as sighting it in "optimally."

Thanks,

Therapist

PS---Technically, I'm RE-sighting it in as it was sighted in when I got it and grouped well, just not zeroed where I used it. I just got a tool to make the adjustments for the first time.

 

[dogmush]

I tend to zero my general purpose rifles at 100yds. with many 7.62X51 loads that puts you within 6" from muzzle to 200yds, and a reasonable Kentucky windage out to 400 or so.

Obviously if you have a specific purpose in mind for your PTR than that can change zero distance.

Here's a page on 7.63X51 ballistics with a couple different loads and applications:
http://www.snipercentral.com/308.htm

 

[henschman]

Max point blank range depends on what size target you're wanting all your rounds to land within.

 

[Ditchtiger]

Does your PTR not have the stock sights?

 

[The_Armed_Therapist]

Does your PTR not have the stock sights?

It does. Admittedly, I have no idea how I gave the impression it didn't.

Max point blank range depends on what size target you're wanting all your rounds to land within.

I didn't even consider that in my original post. I'd be interested in knowing for 3" (radius) and 6" (I guess I haven't decided yet).

Obviously if you have a specific purpose in mind for your PTR than that can change zero distance.

I basically just want to maximize its range, reasonably... 3", maybe 6"... basically maximum point blank.

 

[stubbicatt]

The sight on mine has different apertures for different distances, which run true with ball ammo. Why not sight to 200 meters on the aperture, and be content?

 

[The_Armed_Therapist]

The sight on mine has different apertures for different distances, which run true with ball ammo. Why not sight to 200 meters on the aperture, and be content?

I don't understand what you mean. Find a 200-meter range?

 

[EstPA]

I'm not sure what you are trying to achieve but maybe this will help:
http://mg-42.net/sight_adj.htm

 

[The_Armed_Therapist]

Yeah, I'm just doing a terrible job of trying to explain what I want to do with it, probably because I don't know the right terminology. I guess what I'm trying to say is that I'd like to sight it in so that the trajectory is +or- X... In other words, 0, +3, 0, -3, or 0, +6, 0, -6, etc...

I know the aperture is 200-meters, but I can technically adjust the 200-meter peep to be zeroed practically anywhere I want, right? And if this is a foolish thing to do, then I'd like to know why.

I ran some numbers, and a 25-yard zero would be +2.97" @ 135y and "0" again at 227y, reaching -2.97" @ 266y. Would this be a good way to go about sighting it in?

 

[NeuseRvrRat]

what do you plan to shoot with the rifle?

 

[The_Armed_Therapist]

Any fun inanimate object, really, including targets. I don't plan on shooting any critters with it, but don't want to rule that out. I just want to know where it's going to hit at certain distances, maximizing the effective range, while also doing so with a reasonable trajectory.

 

[HorseSoldier]

I know the aperture is 200-meters, but I can technically adjust the 200-meter peep to be zeroed practically anywhere I want, right? And if this is a foolish thing to do, then I'd like to know why.

Outside of some theoretical limit where there's no more mechanical adjustment in the sights, this is basically (and practically) true.

The one reason I can see for not doing so and using the 30/200 meter zero shooting 147 grain M80 ball or other NATO equivalent is that the sights are already set up to allow you to adjust range by clicking the drum to the appropriate (or at nearest) 100 meter increment. If you zero the 200 meter position for 100 or 300 or whatever meters, it is going to make the rest of the range settings pretty wonky, if not just completely unusable.

 

[The_Armed_Therapist]

The one reason I can see for not doing so and using the 30/200 meter zero shooting 147 grain M80 ball or other NATO equivalent is that the sights are already set up to allow you to adjust range by clicking the drum to the appropriate (or at nearest) 100 meter increment. If you zero the 200 meter position for 100 or 300 or whatever meters, it is going to make the rest of the range settings pretty wonky, if not just completely unusable.

I had wondered about that. I wasn't sure if it would just be 100-meter increments regardless (within reason) of zero distance or if it threw everything all off.

http://mg-42.net/sight_adj.htm

I just looked at that website for the first time and it's great! So that's what HK/PTR91 recommends? In other words, is that how a military using the PTR/HK would sight in their rifles?

 

[The_Armed_Therapist]

I'm having trouble finding a load that actually fits with what's suggested at that website (30/200meter ZEROS). It says "NATO ammo" on the website. Is there a difference in ballistics/trajectory between the .308 WIN and the 7.62x51 NATO that is to blame for the loads not matching up with the website's numbers? Or, is it a rifle-specific issue... in other words, are the website's numbers unique to the PTR?

 

[stubbicatt]

I don't know. I've never tried the 30 meter thing. I zeroed mine at 200 meters and it has been good for elevation at either 2, 3, or 400 meters.

 

[The_Armed_Therapist]

So did you actually find or set up a 200-meter range in order to do the zero? I guess I don't think I'm good enough to zero well at that far a distance. I have good eyesight (20/13), but can't see targets that far. I did do 3.5" groups at 150 yards, though, although I'm not sure how I managed that since I couldn't see well. LOL... Shooting past 100 yards is very new to me.