Weaver 330 Scope Adjustment?

[DCRTorr]

I recently bought an 03A3 with a 2.5X Weaver 330 scope. It has conical-shaped knobs with grooved edges and a slotted screw in the center. Photos of the rifle I bought can be seen at Item no. 225019856 on GunBroker.com, scroll down to see photos of the scope.

Can anyone tell me how to adjust this scope? Are the slotted screws a lock screw for the knobs, or do they do the actual adjustment?

I tried loosening the screws and the knobs did not turn with finger pressure; they look like they take a special tool that fits into notches in the edge of the knob.

Any help on how to adjust these would be appreciated, thanks.

Information

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[mark1]

the outer rings are the locks. Loosen these and than zero the scope. Once zeroed in tighten the outer ring. Make sure you do not move the inner adjustment.

[DCRTorr]

Mark1, thanks for the reply.

I'm not sure what you mean by 'outer rings'; my scope has conical knobs with slotted screws in the center. Do you mean I should loosen the slotted screws, then turn the conical knobs to adjust and re-tighten the screws? What do you mean by the 'inner adjustment' that I should not move?

I tried loosening the slotted screws but the conical knobs did not turn with finger pressure.

Thanks

[DCRTorr]

I think my scope must be the 330S, not the 330C with click adjustments.

[Johnny Peppers]

Are the locking rings slightly knurled at the bottom? They were suppose to be finger tightened, but may have been over tightened at some time and require a little assistance to get them to move.

[DCRTorr]

Yes, they are slightly knurled at the bottom. The seller of the rifle has told me that the screws are supposed to be loosened, the knobs adjusted by hand, and then the screws snugged back down to lock the knobs. Does this sound right?

[Johnny Peppers]

Close, but he has it backwards. The locking rings are suppose to be loosened, and then the screw makes the adjustments. Once the scope is sighted in the screw is held in place with a screwdriver, and then the locking ring is tightened to prevent the screw from moving.

[DCRTorr]

I was able to adjust the scope by turning the screws. However, the knurled rings are tight and I can't get them to move with fingers alone. So, the screws are adjustable but the knurled rings are tightened down. Am I supposed to screw the rings OUT (counter-clockwise) to tighten them against the screw heads? Because with them tightened where they are, the screws turn. Thanks

[Johnny Peppers]

Just as you found, the screws adjust the scope. You may have to get the locking rings freed up by backing the screws out to where the locking ring clears the scope tube, and then holding the locking ring with a padded pair of pliers, and turning the screw with a screwdriver to break them loose. Run the locking ring up to where it hits the head on the adjusting screw, and then when the scope is sighted in, hold the screw with a screwdriver and tighten the locking ring agains the scope tube.

[DCRTorr]

Thanks for the info Johnny, however my scope doesn't seem to lock the screws that way, if I understand what you're saying. My scope has adjustments that look similar to your photo, but the rings are different: they are flat on top, around the screw head, and have radial marks around the flat top (to gauge how far the screw is being rotated). The knurled part is also thinner than the ones in your photo, and there are two notches in the edge on opposite sides, as if it was designed for a special tool to turn them.

I can't seem to figure out how to attach a photo of my scope adjustments to this post.

Right now, the screws turn but the rings are tight against the scope body. They don't turn with the screws. If the rings are supposed to lock the screws when they're tightened against the scope tube, well, they don't seem to be doing that on my scope. Should I screw the screws out, then try to loosen the rings with some pliers? If I can get the rings loose, then how might I get the screws locked in place once I have it zeroed?

If I understand you correctly, the rings are supposed to be loose while I adjust the screws. Then, when I get the scope sighted-in using the screws, I tighten the rings down to lock the screws in place.

Thanks