POI changed?
 

Last year I set my scope with 140gr. Winchester AccuBonds. Over the summer I shot the rest of the box that I set my scope with.

I bought a new box yesterday and went out to shoot a little since our season is less than a week away.

The bullets from this box were hitting about an 1/2 of inch low and an inch to the left when compared tothe ones in the other box. They still grouped very well, just POI wasn't the same. Has anyone ever had this happen?

The scope hasn't moved b/c I also shot a few regular 130gr. Power Points that I keep with me for yotes. These still hit in the same place as they did last year.

RE: POI changed?
 

Many guns I've owned have done that. some more than others and it's why we sight them in every year.

One gun I had that didn't do that was a Remington 760 (two piece stock)

RE: POI changed?
 

It's common enough that you should check your rifle every year. Slight variations in componants, moisture levels in the gunstock, any number of variables cause it to happen.

RE: POI changed?
 

Since the different poi resulted from a new box of ammunition,it is quite possible that the new box is from a different lot#.If it is from a different lot#,a slight change in poi is quite normal.That is why it is advisable to buy several boxes of the same lot# when you buy ammunition.The lot# is usually stamped on the end flap of each box.

RE: POI changed?
 

Happens when I use cheap scopes like tasco or the cheaper simmons and bushnells. Thats the reason I got away from them. Never have a problem withmy leupolds or bushnell elites. But I handload everything, so it may be the diferent lot of ammo.

RE: POI changed?
 

Everyone seems to be ignoring this statement made in the original post.



If the poi has not changed at all for one load,the difference has to be the other load.Bedding or scope problems would effect both loads.

RE: POI changed?
 

its the lot # of the ammo, it happens alot with rimfires also

RE: POI changed?
 

Your right, I was just scanning.

RE: POI changed?
 

Hey guys, I was wondering what you do with the extra valve grinding compound that Leupold sends out with their scopes.....you know the stuff....the stuff they supply so that if the clarity isn't what you want you can polish a little more on your own?????

Ever use it to lap your bolt lugs?

RE: POI changed?
 

Havne't bought a new one in 3 years but no compound with it. Usually the clearest out there. And I have seen em all.

RE: POI changed?
 

been buying Tascos eh???

RE: POI changed?
 

I agree with stubblejumper. Changing lot numbers is the most probable cause. If you do not reload, purchase a few boxes of the same lot number. This will keep you in the black.

RE: POI changed?
 

Vapor, last tasco I got was when I was a kid, it was junk. But not the top of the line. Probably bottom of the line, think it was a pronghorn or something simpler. I went to Bass Pro and looked at some world class's and they didn't hold a candle to a conquest. Didn't pass any of my tests.

American rifleman has a nifty resolution chart in there last issue. hang that bad boy up across a store and set your top of the line tasco on the same power as a VXIII or Conquest and look at the target, then find a dark hole, shelfs work great for this. see if you can read something in it with all scopes. What you are looking for is a strong contrast, like looking in a cave on a bright day. This will tell you some light characteristics. Also look at few different of the same brand. Some will be better than others. Most stores frown on this. But its all about yield.

RE: POI changed?
 

Thank you for that point! Like I said, I have about a half of box of 130gr PP's left from last year that I bought just foryotes. They hit in the same place as last year. Its just the accubonds that have changed. And again the bullets are grouple extremly well, just the POI is a little off. I bought the bullets a year a part and from two different stores. Thanks for the info.the lot # thing, i knew nothing about. Those bullets are $25.00/box so it kinda hard to buy stock these days.[:@]


BigCountry, I would really like it if you posted this on the other thread about cheap scopes. It did not answer any of my questions and takes up my time reading it. I gave the cheap scope bid a rest, so at least do it in my posts. Thanks.

By the time your post got read, It got how many responses that had nothing to do with my question?
Oh yeah, I also did that little test with my scope and I didn't have any problems. Thanks again.

RE: POI changed?
 

A new state law here outlaws the shooting of deer with blue eyes. We can only shoot deer with brown eyes.

I can see that I'll have to upgrade my Tascos to something better because currently I'can't always tell what color their eyes are. Some of the mule deer here are shot running at long distances and seeing the color of their eyes is something my Tascos just can't handle. I can tell nicely at a standing deer at about 250 yards but beyond that things do get blurry and the old Tasco scopes aren't that clear.

Guess I must finally admit that they're not as good as a Leupold.

RE: POI changed?
 

Vapodog
Have a 8X42X56 MM Custom Shop Tascowith sidewheel focus on the AO and you can see the deerseyes real good at 250 yards . Need to get you one;) .

RE: POI changed?
 

getting back to the change in POI.....

it takes so very little to change POI 1" at 100 yards...that's a very small increment for that distance.

A very small change of stress of the stock due to humidity change, a small change of tension in the scope mounting system, a difference of thermal expansion of only a few degrees, a very slight bump against the closet door.

The point is that there's an unlimited things that can cause it and it's not at all unusual.

RE: POI changed?
 

You definately got a point and your 100% correct. But I am a optics engineer, and unfortately, this stupid junk is my life. I know I need a different one, but it pays thebills, and that dream of being a professional hunter doesnot currently pay the bills. For me shakespeare ugly stick is fine for 90% of my fishin, but if I was Graphite composite engineer (whatever), I would probably demand the finest loomis made.

RE: POI changed?
 

i would also agree with sniper and stubbleon this one. every brand of shells can hit in a differant place and even a differant lot number can make a big differant. many guys are happy to shoot two inch groups from box to box. butif youwant the tightest group your gun can shoot then stick with the same lot number until they are sold out. then youshouldresight with the next lot number to keep it shooting astight as possible.:)

RE: POI changed?
 

just resight your gun and gain some valuable practice time. can never have too much of that.

RE: POI changed?
 

Sorry strut, hope you forgive me. Just trying to help in a field I know something a thing or two about. Why are you coming down so hard on me? Was this that bad of an offense to accidently scan one of your messages? Whats the deal man? Sorry,I can't abide by your demands. It is an open forum. Just the way it is. Sorry I didn't answer the original question,but its not uncommon for questions tomorph. Just the way forums work man.

RE: POI changed?
 

Yes it is an open forum. If you read your orginal bit on this post, it has nothing to do with what I asked. And I honestly feel that your comments were coming over from the other thread about cheap scopes. If you were to have not read the ten or so pages that have been beat to death about it, then yes, I would see where your comment would have been valid.

I think we have all read your arguement of why you must pay $600-$1,000 to get a good scope. I just see nothing valid in your reponse to my question. Its kinda like this I feel if you don't have any knowledge of what I asked, then don't use a post of mine to rack up your post count. I know that this isn't MY forum, but if you read enough you will see that just about EVERY post, by the 3rd response,the whole posthas nothing to do with the orginal one and the orginalposter hasn't learned a thing.Example, look atthis one...first two are three responses were just what I asked. Then read the replies after yours. It totally turned the post back into a "Cheapscope" post. I am sure others that ask questions feel the same, they just don't say anything about it. If you notice theres a couple of here that has even thanked people for answering their questions and not carrying on.

I have no problems with anyone on this forum. I think theres a wealth of knowledge on here and have already learned a thing or two.Just wish that people having no valid knowledge of what they post on would not waste our time.[&:]

RE: POI changed?
 

Now that the childs play is out of the way.


I went out today to shoot. One click to the right and two cliks up fixed the problem. Thanks for the help.

RE: POI changed?
 

Strut to be honest with you, I can't recall your post on cheap scopes or remember you.Sorry, I remember talking to vapor mainly on the matter. There are so many struts, it impossible to keep track of them or bigcountry's as there is alot of those also, so I am very surprised you remember me. I talk to several struts on several forums. And really can't remember talking to you. I just simply scaned your message rather quickly, and saw a POI change. Stubble brought it out to me, and I replied, your right, very simple mistake.

You must have not totally wasted your time, you took the time to try the tests I mentioned to vapor and said no problem found, which I am not sure is you compared them to others and found yours superior or what. And that can be a rather time consuming test. Sorry, I have not ever helped you, maybe I can help youin the future or you help me understand a thing or too. I am sure open to knowledgeable posts.

RE: POI changed?
 

I done that "test" when I bought my scope. Not after I read your post.

I did not have a post on "cheap scopes" It was the post on "why pay so much for a scope" or something like that. And it wasn't mine either, it was someone else's, but the point was made.

And if i am not mistaken you PMed me about another post that got out of hand about you callling me a liar about my shooting. I will go back and check to see if it was you, if it wasn't then I appoligize. If it was then no offense, but you may be some memory problems b/c this was just a week or so ago.

But anyways. Problem fixed. So next thread.

RE: POI changed?
 

Welp, I checked my inbox. If your name is Mark then yup. It was you.

But it doesn't matter. Good Lord's will, I will wake up in the morning and so will you. So no harm done.