If you are sure that the scope was mounted correctly to begin with, ie plenty of elevation left THEN you can install a slanted rail that will increase you elevation potential. Of course, that comes at the cost of having less elevation at the lower end.
A second solution is rings, like those by Burris with the plastic inserts. They have an accessory insert kit for these Signature Zee rings that will let you increase your elevation. Rings are ca 30 and the kit'll be ca 10, so 40 total.
If you're just missing a wee bit of elevation you could just lightly shim the scope in your current rings.
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Most of the time a scope that creeps off its zero, has a loose mount screw and or loose mounting ring. Check the mounts all screws. Some times the opposite is true. The mounts are to tight and in a bind. Then during firing the receiver heats up an tweaks the scope enough to cause creep. If the scope is always on zero when cold and creeps off after a few shots, she is in a bind. Make all adjustments to the scope base and rings with a cold gun. Loosen the front ring screws first then re-tighten then loosen the rear doing the same. Then try and re-zero the gun. If the gun never comes back to zero, you end one day shooting hi to the right and try again the next day shooting in the same spot try to re-tighten all screws. Screws from mount to gun then scope rings to scope body.
If you have 2 knobs, there should be no left knob. If you have a knob on the left, you have it mounted 90 degrees out of alignment. Loosen the rings and turn it 90 degrees clockwise. Once you do that, the knob on the top is the one you will use for elevation.
If you have 3 knobs, the left one is for parallax adjustment, focuses the scope for specific ranges. the top knob is the elevation adjustment in this case also.
be cearfull you dont crush the scope tube,,but try rapping a little strip of sticky rubber or plastic tape round the scope tube then nipping the scope ring caps down onto this,,,but i think your scope rings are worn out or the wrong size,,ie 30mm not 25mm
i have air rifle scope's on my 7.62/308 and on my 303 none of them move about at all and they have stayed on zero for years now!
Is that the "Prairie Master"? I think Simmons is pretty uniform in that range of scopes--elevation adjustment should be the top dial and windage is on the side. The zoom locking ring should be in front of the eyepiece, with the zoom ring just forward of that.
Bushnell sells nylon inserts for scope rings that fit inside of the scope rings and will affect the height of the ring to correct the problem. If you install them on the front scope ring, it will correct it and realign the rings correctly. It appears that the front ring towards the muzzle is not as high as the rear ring near the breach. This is why that even though the scope's adjustment is elevated as high as it will go, it is still hitting low because it is actually pointing down because apparently the rear ring is higher off the barrel than the front ring. The Bushnell inserts can correct this.
Your problem is in the bases/rings. Remove the scope from the rings. Lay a straight edge in the bottom of the rings. The straight edge should touch both rings equally. If i understand you right, you have run out of adjustment up. If so, there will be a gap on the front ring. Verify that you have the correct bases for your rifle first of all. Then, depending on the rifle, you may be able to swap the front and rear bases/rings and correct the problem. Check alignment as above. NOTE: After rings are corrected, re-center scope elevation. Turn elevation screw on scope one way untill it stops. Count the clicks as you turn back to the opposite direction. Devide the clicks by two. Turn back the other way by that number. Your scope is now centered. Test fire at 25 yards. When close to zero, move back to 100 yards and fine tune.