Tasco 3x9 help needed please

[awp101]

Transferred a Tasco 3x9 from a NEF .223 to a NEF .22H today at the range and it won't adjust low enough to hit at 25yds. I have to aim at an 8x10" target ABOVE the target I'm shooting in order to hit.

It's been probably 10 years since it's seen any action and the height adjustment is bottomed out. My usual course of action is to hit things that don't move with Rem-Oil but I didn't on this since I don't know what, if anything, it might do.

Any ideas or suggestions before I toss it and buy a new scope?

Thanks!

[RSY]

There's three things I'd try:

1. Run the adjustments up and down their full range a few of times and try again with the .22H.

2. Put it back on the .223 and see if it works any better, in order to isolate either the rifle or the scope as the problem.

3. Last resort: turn the scope ninety degrees counterclockwise in the rings, thereby switching turrets for elevation and windage.

Good luck,
Scott

[Blaine]

Make a small shim from a pop/beer can and put it under the back mount.......

[Bronco]

I'm thinking a shim under the front mount!!

[Andrew]

I'm thinking a shim under the front mount!!

Ohh! So close, but no. Shim the back if neccessary. Pretty cheap way to fix the problem.

[AJMD429]

Even though it shouldn't matter, with some mounts, including high-quality ones, I've switched front and rear scope mount and resolved such a problem. I've also turned scopes 90 degrees, although mostly if there are clearance issues accessing the chamber or brass hitting the scope if it is low-mounted.

There are mounts made with some elevation adjustment, but they cost way more than a new scope (although it may be something ANY scope would have trouble with depending on whether the receiver/barrel/mount is an issue).

I haven't used the aluminum shim method, but I've used black electric tape for the same purpose; shim the rear mount base a bunch; and I'd shim the top of the front base even though it won't improve the angle any. a) because it would help cushion any tendency for the rings to dent the scope if the angle is too much, and b) out of pure obsessive compulsive desire for some sort of 'symmerty' .

[RSY]

I'm thinking a shim under the front mount!!

Ohh! So close, but no. Shim the back if neccessary. Pretty cheap way to fix the problem.

It'd be the front mount, actually.

RSY

[O.S.O.K.]

yep - front mount. Think about it - if you raise the scope up, you have to point the barrel down to bring it onto the target - see? Counterintuitive. Just like adjusting the front sight left to make the groups go right.

I'd also suggest lightly knocking the scope against something padded or rubber - to jolt the innerds. It may just be hung-up.

[Buffboy]

I ran into this problem with a scope (factory installed) on a pellet gun trying to sight it in at 10 yards. No adjustment to the scope seemed to move the POA. Finally set it in a rest, moved my head with the rifle immobile and the crosshairs moved all over the place. The scope's paralax was set for 100yards and there was no way to set it up to shoot at that short distance. I was annoyed because they put a scope for a big game rifle on an airgun and I took it off. The gun shoot great with the iron sights. I intend to eventually take the scope back to Cabellas and complain. I suspect that you may have the same problem.

[awp101]

Well this morning your intrepid, cub reporter realized he made a boo-boo yesterday at the range.

They say most accidents involve a minimum of three failures. Mine yesterday were frustration, impatience and operator headspace and timing.

Frustration:
Using iron sights, I never had been able to get the rifle to do anything other than pattern even at 25yds. I wanted to use the scope to see if it was rifle or me since I do better with a scope vs irons. I like this little thing and I want it to shoot well.

I took the scope off the .223, mounted it to the .22H and tried to do a quick and dirty boresight by looking through the barrel and adjusting the scope until I saw close to the same picture. I never could see a difference in the elevation though. I finally figured out that if I aimed at the target placed diretly above the target I was aiming for, I could hit the bottom target. I was rewarded with with a nice group of just over 1" horizontally spread since I was in a hurry which takes me to impatience.

Impatience:
The Leverguns Safari is coming up fast and I hadn't tried the 3 .44M loads I'd selected as probably being the best choices (WWB 240g JSP, Grizzly 275g BCFP and Grizzly 300g WFNGC) for best accuracy. I have to hit the range early in the morning otherwise the heat is so brutal it's just not any fun. I needed to confirm my zero for each load on the 25yd range before moving to the 100yd range. With that in mind, I rushed through the scope test of the .22H. FWIW I think the 300g Grizzly load is what I'll be using on the piggies or deer.

Operator headspace and timing:
Dad told me late yesterday he'd be headed to the range today if I wanted to meet him out there. It was going to be early again so I figured why not? Loading up a couple of pistols I need to shoot it dawned on me that I was having to aim high with the .22H because I HAD THE ELEVATION BOTTOMED OUT and I was shooting WAAAAAAAAAAAAAAAAAAAAAAAY LOW!

I brought the .22H with me and after we were done with the pistolas I went to the 25yd range and tested my theory. Sure enough I was on paper where I wanted within 8-10rds after raising the elevation.

Geez, YK makes a mistake this week, I make one this week, what's this board coming to?

And to top it off the scope DOES have a problem. It's stuck on 3x and I can't see much with such low magnification.

[Bruce Scott]

yep - front mount. Think about it - if you raise the scope up, you have to point the barrel down to bring it onto the target - see? Counterintuitive. Just like adjusting the front sight left to make the groups go right.

I'd also suggest lightly knocking the scope against something padded or rubber - to jolt the innerds. It may just be hung-up.

It was shooting low. " I have to aim at an 8x10" target ABOVE the target I'm shooting in order to hit." To get on target the scope needs to be pointing at the point of impact which, according to my way of thinking, can only be achieved by raising it at the rear end..... Or am I completely confused

[RSY]

Or, am I completely confused

Well, I wouldn't say completely.

Think of raising the sighting plane as pushing the barrel down. It's as simple as that.

I know it's somewhat counterintuitive. It baffled me for a bit when I first learned to BZO the M16A2 at Edson Range, once upon a time, which is largely done by raising and lowering the front sight post.

Scott

[Blaine]

No......It won't shoot low enough....back sights adjust in th direction you move them. Shim the back and the crosshairs GO DOWN. Shim the front and they GO UP. On a front post sight, you screw it down to go up and vice versa.

[TedH]

Or, am I completely confused

Well, I wouldn't say completely.

Think of raising the sighting plane as pushing the barrel down. It's as simple as that.

I know it's somewhat counterintuitive. It baffled me for a bit when I first learned to BZO the M16A2 at Edson Range, once upon a time, which is largely done by raising and lowering the front sight post.

Scott

That's what he's saying. The bullets were already striking too low. If your raise the scope's sight picture, it's just going to shoot lower still.

[Blaine]

and it won't adjust low enough to

Gotta read from the start......He can't get low enough is the problem. Cross hairs need to go down.

[RSY]

Reading the original post, I now see my problem.

It says "it won't adjust low enough" and then goes on to say I have to aim at an 8x10" target ABOVE the target I'm shooting in order to hit." Well, those two statements are mutually exclusive. It sounds like it actually won't shoot HIGH enough. I read the first one and based my (correct) advice on that. I obviously need to read the whole post next time.

As for moving the crosshairs down, in a literal physical sense that will raise the POI. Down adjustments on a scope are actually raising the crosshairs.

Scott

[RSY]

Shim the back and the crosshairs GO DOWN.

And if the crosshairs go down, the POI goes UP.

[Bronco]

Oooops I be wrong!!

Rear mount is right.

[Blaine]

Shim the back and the crosshairs GO DOWN.

And if the crosshairs go down, the POI goes UP.

You have to help me with this one.....Why are scopes backwards from iron sights? Are the crosshairs on the first set of lens that turn the image upside down and then the view rights itself with the back set? Add to this, I think (UhOh ) that I corrected a similar situation with the advice I was giving..... Not trying to be argumentative.........just sayin'

[Bruce Scott]

Shim the back and the crosshairs GO DOWN.

And if the crosshairs go down, the POI goes UP.

You have to help me with this one.....Why are scopes backwards from iron sights? Are the crosshairs on the first set of lens that turn the image upside down and then the view rights itself with the back set? Add to this, I think (UhOh ) that I corrected a similar situation with the advice I was giving..... Not trying to be argumentative.........just sayin'

It only seems backwards. Imagine the gun was fixed in a vice and the sight(s) -scope or irons- are aimed at the centre of the bull. The bullet impacts 2" low. The sight(s) need to be adjusted so that it/they are aimed at that bullet strike. Lowering the cross hair does exactly that, as does raising the rear sight. Assuming your adjustment is correct, fire a second shot and the two points of impact will coincide. Now unlock the imaginary vice and aim at the bull. You'll be on target.

Well, that's how I see it.....

[RSY]

Why are scopes backwards from iron sights?

It has to do with the fact that scopes are 2D systems, whereas iron/open sights are 3D systems.

Scott