Sighting GAMO 3-9x40 scope

[Dsm_South West]

I'm having some real trouble sighting the GAMO scope.  My first method was sighting it in at 30yds.  First couple of tries It was way off.  I adjusted the windge and elevation, I then shot a few more and finally hit the target.  Though It was grouping  1'' apart @ the bottom right of the target.  I then try to adjust the windage and elevation some more and nothing, still grouping to the bottom right.  By this time I've tried so many times nothing seems to work.  Then I found a thread on here stating I should start from 10m.  I try this method and still nothing, I can't even get a hit from 10mm.  The only possible way I've found to hit the target is by aiming off the target about a foot to the left.  I've tightened all screws that I can possibly find and still nothing.  I don't know If I have a faulty scope or If I'm doing something terribly wrong, any help is greatly appreciated.

[Splash]

It may be a bad scope, or it could be that your rifle doesn't like the diet, you should have the best luck with a domed pellet. Also the scope and or mounts could be slipping. Put a pencil mark on the scope and mounts, fire a few rounds and see if either one moved. What kind of groups do you get with iron sites? If you get good results with the irons, then either the scope is moving, or it's toast.
Mike

[Dsm_South West]

Well I just inspected the scope mount and it's seems to me that the pin on the mount that goes in the receiver to keep it from sliding is busted.  What a disappointment, I've only had the gun for 3 days.   Since my original post, I can't seem to hit anything at all, cross hairs are directly on the target though the pellets just don't seem to hit.  I'm using 2 different types of pellets, premier hollow point and Daisy precision max pointed pellets which I happen not to like at all.  I'm seriously thinking of returning this particular gun and swapping it out with another.  As for the iron sites, Big Cats don't have them, at least mine doesn't.

[Splash]

A bad mount will do it. You may be able to contact Gamo and they should replace the mount, or take it back for a replacement, or refund. You can get a 440, same internals with a wood stock, at Natchess for $99.
Mike

[Dsm_South West]

Well, took the Big Cat back to wally world got my money back.  Headed to Big 5 and got me a Gamo Hunter Sport along with some decent pellets (RWS Super Points 8.2gr).  The quality between this one vs. the Big Cat is like night and day.  Took the first shot and boy did it catch me off guard, sounded like a .22 firearm.  I'm very pleased with this one.

[SGTMEATSAUCE]

If it was that loud you should run some patches thru the barrel, it may be dieseling from factory oil. A 8.2g pellet should not break the sound barrier, usually around 6g's or non-lead Raptors(5.4g?).   Top consistent shooters in most 1000fps rifles are pellets in the 7.9-8.5 range, the sweet spot is suppose to be around 8.2-8.3g. Try RWS superdomes (8.3g) these work work well and so do Crosman Premier hp's(7.9g), Gamo Hunters(8.3g) and Rockets(9.6g or 8.2g different sites says different, nothing on the can) and Predators(8.10).

[Dsm_South West]

Would you recommend putting a couple more shots through the gun or immediately run some patches through it?  The gun has only been shot 3 times.

[SGTMEATSAUCE]

I would clean it now since you shot Raptors through it and it still has factory oils in it. Then shoot only 7.9-96g pellets....jm

[Dsm_South West]

I'm not shooting raptors.  I'm shooting RWS Super Points 8.2gr

[SGTMEATSAUCE]

STILL CLEAN THE BARREL, NOTHING CAN GO WRONG WITH A NICE CLEAN BARREL

[dave2288]

also, after 20-50 shots, the gun will calm down a bit, and stop shooting so fast...then you'll start getting much better accuracy...then, you can start working on tuning it, and making it an incredible shooter!  also, i just as a general rule, do not use gamo scopes...they usually don't work too well, and i don't use non a/o scopes...too much potential parralax...i want to make sure i hit where i think i will.  i would go with a $50 leapers or something like that.

Dave

[Dsm_South West]

Thanks for the response.  I've shot somewhere between 250-300 rounds, so I'm quite sure it's calm down some.  She's shooting real good even with the Gamo scope.

[wolf1bravo]

I hesitate to write this, but having had a similar problem initially sighting in my Hunter Elite with the Gamo/BSA 3-9x50 scope I thought it might be worth mentioning "just in case."  After my first attempts to get the thing close, I found I was aiming about a foot off the target at 25 yards.  With a hold that far off, I could get pretty consistent grouping.  Without going thru all the details, I discovered I'd been tricked by reading the instructions on how to set up the sight wrong.  I was turning the knobs the wrong way.  The GAMO instructions for the sight and the arrows on the azimuth and elevation adjustment knobs gave conflicting instructions.  If you already know how these things work, then it's simple; but the first time you try to sight  one in, it's not simple.  
Once enough ammo was fired to settle in the rifle and I installed a GRT III trigger, it'll drop a squirrel at 25 to 40 yards with one shot about 90% of the time.  I've nailed about 10 in the last month and only had one run away after it was knocked out of the tree.  On paper, it'll shoot 8 out 10 within 1" radius at 25 yards.  (no wind)  And I don't have a real steady hold.

[SGTMEATSAUCE]

What is correct? The arrows on the scope, not the instruction book right? Mine is dead on indoors at 35 ft, 1 ft high and 7 inches right at 20 yards, at the limit of the screw adjustment it just will hit paper at that distance. I gave up and at least at night I use the laser to hit anuthing further away pretty accurately. Since I only shoot indoors into my trap which is 35 ft(I get parilax on anything above 5 power) the POS Gamo 3x9x40 is good enough....

[gamo2hammerli]

Your pellet is still going up.

Most of my air rifles are "zeroed" in for 8 meters (Max distance in my basement...).  When I take them outside to shoot...the pellets will raise....at 10 meters about 1/2", at 20 meters about 1 1/2", at 30 meters about 3"....at 40 meters the pellet comes back down to about 1/2" from bullseye....can't really tell because my hands are not that steady.    Only one of my rifles have an after market scope...a Banner 3X9-40mm AO...the rest have the ones that came with the gun....either Crosman or Gamo...one Center Point....I think most of them are lower quality scopes.