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Lost zero after 90 shots--normal? |
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tpcollins
Optics Journeyman Joined: January/12/2009 Status: Offline Points: 428 |
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I have the Fat Wrench as well. The specs call for 10-15 inch-pounds on aluminum rings (which I wouldn't recommed) and 15-20 inch pounds on steel rings.
I tighten mine in incriments and in a sequence (like the lug nuts on a wheel). I tightened all screws to 10 inch-pounds, retighten in the same sequence to 15 inch-pounds, do it again at 20 inch-pounds. I am a bit anal though . . .
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proimion
Optics GrassHopper Joined: June/21/2012 Location: CO Status: Offline Points: 9 |
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Another update from the OP. I re-zeroed the scope today and fired 120 rounds. Held zero just fine. I was able to consistently hit my targets at both 100 and 200 yards with no trouble. I really like the scope.
Thanks for the advice, y'all. I chose the Wheeler FAT wrench because it was easily available from Amazon and other places and it comes with a nice variety of bits. I chose 15 in/lbs of torque on the rings, because, well, that's what seemed best. I couldn't find any documentation from Burris that said what torque to use for the PEPR rings. And the Wheeler documentation didn't seem to apply--their recommendations were much higher but seemed to be for larger screws and/or steel rings. So after a lot of searching around, two numbers consistently came up: 18 and 15. Indeed, both were also recommended on this thread. So I chose 15 and figured if it proved to be too loose, I would try 18. But after 120 rounds, the scope did not move in the mounts and it held zero. I suspect that previously I had it too tight. |
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Sparky
Optics Master Extraordinaire Joined: July/15/2007 Location: SD Status: Offline Points: 4569 |
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Thanks for the update. Glad to hear it is working for you.
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SVT_Tactical
MODERATOR Chief Sackscratch Joined: December/17/2009 Location: NorthCackalacky Status: Offline Points: 31233 |
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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln
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RobGR
Optics GrassHopper Joined: March/26/2013 Location: Oceanside, CA Status: Offline Points: 1 |
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Bumping a dead thread here, but I found it helpful because I was dealing with the exact issue.
For anyone who finds this thread in the future, I emailed Burris and got the following response - Hi Rob, Make sure the ring top screws are torque to 22 inch pound and the cross bolt at 85 inch pounds. Yup, (I) use LocTite blue on my bases and rings. Regards, Brian Fowler Customer Service Technician Not sure how to measure the torque on my cross bolt, but will probably go 20 inch pound on the top ring screws.
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Magnumdood
Optics Apprentice Joined: January/17/2009 Location: Illinois Status: Offline Points: 226 |
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Seekonk torque drivers. Each Seekonk driver is pre-set to a specific inch/lb torque. The bad news is they are expensive; $115.00 per driver. I have 4 of them; 65 inch/lbs, 25 inch/lbs, 20 inch/lbs and a 15 inch/lbs. I bought one per year starting about 10 years ago. To me, for mounting scopes, they are hard to beat.
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America - Home of the Free
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billyburl2
Optics Master Extraordinaire Joined: January/08/2009 Location: Cottonwood, AZ Status: Offline Points: 4015 |
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http://swfa.com/Borka-Tools-MG7-Multi-Torque-Driver-Kit-P59403.aspx
This what I use on everything firearm related! It flat works!
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If it is tourist season, why can't we shoot them?
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Rancid Coolaid
MODERATOR Joined: January/19/2005 Location: United States Status: Offline Points: 9318 |
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85 and 22? Really? Wow.
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Respect is something you earn. Equality is something you whine about not being given. |
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koshkin
MODERATOR Dark Lord of Optics Joined: June/15/2004 Location: United States Status: Offline Points: 13182 |
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That while that is not necessarily the case here, I have found that some ring/mount makers recommend higher torque ratings than really necessary. With some scopes these torque ratings can actually cause problems (not the SS), but from a mount maker's standpoint it is better to risk the scope than to have the customer think that the mount is not good enough and the scope slipped. ILya
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