Posted: 5/20/2009 10:39:34 PM EDT
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I'm new to scopes and I zeroed my PTR 91's scope(Burris 3x9) at my indoor 25 yard range. I had 3 shots going through the 1st shots hole dead center on the target. Today I took it out side and shot it at 100 yards to see where I was hitting. I was under impression that a zero at 25 yards will be a little high at 100 yards and a little low at 200 yards.
Well my 1st group(3 inches total) was 5 inches to the left and 9 inches high! Why would my windage be off when it was right on at 25 yards at the indoor range and why so high? No wind at all. I clicked it back centered and brought it way down to about 2 inches high. Fired it at 250 yards and was about 6 or so inches low. At 250 yards a clay pigeon was very hard to see even with the scope on 9. Maybe I should have got a 14 power. How far are you PTR owners shooting out to? What size groups are you getting at 100 yards? Thanks for any input! |
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Quoted:
25 to 30 yards is a good zero for GP. that's a hit on the up and close and maybe at 100 but If you would be so kind to offer a little more information we might be able to help you more than you envisioned. What info do you need and I'll fill you in! Thanks! |
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Quoted:
Quoted:
25 to 30 yards is a good zero for GP. that's a hit on the up and close and maybe at 100 but If you would be so kind to offer a little more information we might be able to help you more than you envisioned. What info do you need and I'll fill you in! Thanks! What are you shooting for starters. I'll help ETA You posted that info..Sorry it's my night off so I got the Buzz going. Let's restart this once more.. You have a weapon, you sight it in at a close range (this is about the weapon)that is the same (one flight path that cross the same plain)as a longer range. Any projectile will cross the same plain twice. The key is sighting in on the first plain. This removes most of the Human factor. |
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I'm shooting a PTR 91 which is a high quality HK 91 clone chambered in .308. I have a lower end Burris Timberline 3X9 scope on it.
I had it perfectly sighted in at the indoor ranger at 25 yards but as soon as I went out side to 100 yards I was 5 inches to the left and 9 inches high. I can understand why it was high( I thought it was only going to be a few inches high...guess not) but windage should not have changed......right? Never knocked my scope either. |
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5 moa right and 9 moa down.then see what happens.
Really it could be you or the weapon. A tight group = you did your part, hence it's the sights or scope being off. PS check your screws on the scope and mounts, if it wanders about while you are doing your part. |
| You should be about 5.5 inches high at 100 if you are on at 25. You would be sighted in at about 350 yds. That is assuming that you are shooting a 150gr M80 surplus or equivalent. I suspect that the windage is due to the mount shifting. If that is not the case, I woud make sure that all of the machine screws in the rings and mounts are secure and properly tourqued. Make sure you loctite them. It appears that something is shifting. If that is not the case, next step would be to shoot the square. Shoot three rounds and adjust the scope so that you shoot about 20 clicks to the right, then three shots the same number of clicks down from that, then ten left of that, and finally, back up to the original position and see if it repeats the original group. If not, the internal adjustments are the cause. |
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I can't give you advice on why you are off so far from 25yds, but I suspect that if you consider 4x distance will multiply your errors 4x that might be ok. I would zero for the 100 yd and go back and shoot 25yd to see where you are at. I would bet that you would be where you expect. As to not being able to see a clay a 250 yds, more magnification will not help. It is the quality of the optics that counts(More $ = better). I have a 2.5x10 Nightforce that is crystal clear at that distance and a Simmons 4x14 that is not so clear. HTH
ETA. Burris is a pretty good scope, so i'm not knocking it. Is it adjustable for parallax? what model? |
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Thanks for the replys guys. I was shooting South African 147gr from a couple different batches for the late 70's and early 80's. I'll check a my rings and screws and try again. In the end I was able to hit clay pideons 50% of the time at 250 yards and the rest of the time I was low about 3 to 6 inches.
What kind of groups should a PTR get at 100 yards? Is 1 inch resonable or more like 2 or 3? Thanks again! |