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Old 03-07-2017, 09:18 AM
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Very strange

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Not a lot of help I know ... but maybe. I have a perfectly good Weaver scope I have had for a long time and it has been mounted on a variety of rifles with no problems. It has been on the shelf or a while until this last week or so when I purchased a new 17HMR (CZ455). I thought OK the old weaver can go on there, so went up into my box of 'bits' where I have a selection of rings and bases. I picked out a set which looked almost new , if not new and they were wired together as a pair. Fitted them and the scope....looked good. Went down to my wood to zero and to start with found I was almost on maximum elevation just bore sighting. Hmmmm???? Fired a couple of shots and they were 4 inches low, smack in the centre line and I ran out of adjustment ... HMMMMMMM ?????????
I needed to have the rifle up and running that evening, so dived back into my box of bits and found another set, different make, slightly higher. Set them up, fitted another scope and the rifle was grouping ragged holes at 80yrds.
That set me thinking so I checked the Weaver scope, no damage I could see and it was strange that it was shooting perfectly centred on windage. OK, check the rings, which to the eye initially looked exactly the same. However, I felt that one base of one ring was just slightly bigger than the other, but hardly. I got my steel rule and checked the measurements and the base of one was 0.5mm taller than the other. Hardly noticeable with the naked eye. I could have binned that old Weaver as a result, so lucky I didn't.
I repeat, these rings are identical in every other way. I just wonder if the two had got mixed between batches. I've had them close to 25yrs, so nothing I can do or wish to. Just thought I would bring it to notice in case y'alll have a similar problem...don't ditch that scope till you check the rings.
CCAguns, jodum, Davers and 4 others like this.
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Old 03-07-2017, 11:49 AM
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Glad I am not the only one with oddball problems. I mounted a new scope on a new to me Savage 99 in 300 Savage. Bore sighted scope but shooting eight inches left at maximum adjustment. I told my cousin about the problem as I laid the rifle on the bench. My cousin pointed to the rifle and said he saw the problem. Looking g at the rifle as it may on the bench you could see the holes were drilled out of line. I replaced the rings with a Leupold adjustable mount to move the rear of the scope to the left. The scope is now slightly offset but it now shoots dead on.
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Old 03-07-2017, 11:51 AM
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Glad you got it figured out! Several years ago while I was visiting a good friend he asked me to have a look at a rifle that he was having a problem with. He'd just mounted a scope on it, but couldn't seem to get it close to bore sighted. He handed me the rifle and after a few moments, I could see that he'd gotten the front and rear rings reversed on a Ruger M77. I don't know if that caused any permanent problems for that scope.
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Old 03-07-2017, 12:13 PM
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The problems that Sus and Tnhunter cited I've encountered before. In the caseof the M77 its very noticeable but you have to give it a second look if trying to use 77 rings on a #1.
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Old 03-07-2017, 06:07 PM
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Did what to the scope!?

Sometime back I picked up a pretty nice Vanguard with Bushnell Scope. Made up some cartridges and headed for the range. Nothing worked. Turns out the front base was for an FN Action and the rear was wrong too. I should have been paying more attention. Shortly, afterward I traded into two Leupold 3x9 scopes. Bubba(s) had attached these rings so that the screws were all the way down on one side. A big gap was on the other side. Red Loctite was used on the screws. Screw heads had to be drilled out. The gunsmiths did a good job. The rings were salvaged. Other than scratches, the scopes were unharmed. Another time Bubba had sealed the turrets on an old Redfield 4x with pipe dope.
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Old 03-08-2017, 05:11 PM
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Sorry about your problem with the rings.

Strangest problem with rings I've incurred was with a set of Weaver rings I bought at Wal-Mart. Installed them on a rifle, put on the scope and went to range to zero it. Had a problem getting what I knew was a perfectly good scope to zero. Gave up and went home, where I'd discover one of the scope rings was loose on the scope base. Turned out, despite how tight I'd tightened the screw on the scope ring, it would not secure the ring tight on the base.....stayed loose. I'd used these Weaver rings before with zip problems and wasn't the first time I'd mounted a scope on the scope base of this particular rifle.
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Old 03-09-2017, 08:23 AM
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Rings can make a big difference!
One of the first rifles I ever bought was a 760 Rem in 30-06 that had weaver see-through bases and a Tasco 3-9 power scope. I bought this gun at a trading post in Northern Michigan. The owner let me have the rifle at bargain basement price ( $120.00) because he said the rifle wouldn't shoot straight. I figured what the heck, I'd try and see if I could get it to shoot. I got it home and messed with it for awhile and in doing so had removed the scope and rings. When I replaced the rings on the rifle I turned the rings around and then mounted the scope. when I got to the range I found the rifle was shooting less than an inch groups at 100 yards with factory ammo. I was about 19 at the time and didn't think about the rings until I saw the big difference in how the gun shot. I learned a good lesson from that rifle.
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