New Posts New Posts RSS Feed - Scope flexing??
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

Scope flexing??

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 15:57
Kevin L View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: September/18/2007
Status: Offline
Points: 6

Earlier this week, I caught an episode of "Future Weapons" on cable.  During the show, they were testing a 50BMG rifle at long range.  What was surprising was the slow motion photos of the weapon being fired and how much the scope "flexed" during recoil.  What I saw was certainly not a scientific observation, but the scope appeared to flex about 1/4" up and down.  This made me curious as to how much flex occurs on scoped modern centerfire rifles (30.06, 7MM Mag, 300 Mag, etc) and how far off the barrel the scope bell should be.  I've always mounted scopes as low as possible, but this has me thinking that 1/8" clearance (from some low mounts) may not be enough.  I realize the recoil of a 50BMG is substantially more that any "deer rifle" class will generate, but I'm still curious.  Anyone have any experience with how much a scope will actually flex under recoil, and how much clearance under the objective bell is necessary? 

 

Thanks

 

 

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 16:11
Graysteel View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: October/02/2007
Location: United States
Status: Offline
Points: 200
That's it..... we all need to get super fast video cameras! Too much is happening too fast. :)

So when you going to start stocking them Chris?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 16:26
Dale Clifford View Drop Down
Optics Jedi Knight
Optics Jedi Knight


Joined: July/04/2004
Location: United States
Status: Offline
Points: 5087

http://www.youtube.com/watch?v=s5pVya7eask

 

know people who have them touching, with no problems, pt. to remeber the 50 can generate 100 ft/lbs of recoil while most rifles hardley reach 25 ft/lbs. obviously the more recoil the higher the risk.

the amazing thing to me was the base flexing.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 16:29
cyborg View Drop Down
Optics God
Optics God
Avatar
God of Wind

Joined: August/24/2007
Location: North Georgia
Status: Offline
Points: 12082

Scope flex is really of no major concern, the damage from recoil certainly could happen, but in most cases would likely not even chip paint, or powder coating, I like 1/8 inch myself, or as close as i can get to it.

This is simply another case for buying well made optics that's all there is to it.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 16:49
Big Squeeze View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar
GOOGLE NINJA

Joined: August/30/2007
Location: Anaheim, Calif.
Status: Offline
Points: 3143
Kevin L.............I saw the same episode. However on hi-powered centerfire rifles, there shouldn`t be any scope flex whatsoever. Whether your scope is 1/32" or a 1/2" off the barrel, there shouldn`t be a problem as long as it is mounted tight enough.........The only comment I can make as to what we saw in that episode, was possibly a design characterestic for that particular mount causing the flex.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 17:18
RifleDude View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: October/13/2006
Location: Texas
Status: Offline
Points: 14313
If you look at slow motion video of just about ANY rifle, bow, whatever, you will see some flexing of the whole system going on.  I saw a slo mo video of a compound bow being shot and the entire riser bent somewhat during the shot!  It occurs to some degree with anything with moving parts, especially with heavy moving parts which have a lot of inertia, as is the case with the 50 BMG.  As long as you have some clearance between the scope bell and the barrel, you should be fine with most shoulder fired rifles, though it's possible the scope and barrel could make contact on an extremely heavy recoiling rifle and heavy scope if there is very little clearance between the two.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 18:17
RONK View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar

Joined: April/05/2007
Location: United States
Status: Offline
Points: 3199
 I saw something like that, too and was shocked by the amount of flex in both rail and scope. I bet we'd all be surprised how much of that occurs on our .300s and .338s too.

Edited by RONK
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 18:22
Kevin L View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: September/18/2007
Status: Offline
Points: 6

Thanks for the input.  I suspected the same - that it was insignificant with most centerfire rifles (some African calibers might be a different story).  I was just curious as to whether there were any more "scientific" studies done by scope manufacturers.

 

 

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 18:28
Dale Clifford View Drop Down
Optics Jedi Knight
Optics Jedi Knight


Joined: July/04/2004
Location: United States
Status: Offline
Points: 5087
better scope makers have "accelerometers" they test the scopes on in terms of G forces, if they release the studies I'd be really suprized.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/23/2007 at 23:03
Graysteel View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: October/02/2007
Location: United States
Status: Offline
Points: 200
I wouldn't worry about it too much. Most of the recoil pulse is inline with the bore. And if you ask anyone who has dropped or bumped a scope it doesn't take too much to mark the finish or bend the lip of the objective housing. As I have never seen a mark on a scope that was mounted close to the bore, I would say you are pretty safe. If it really concerns you put a bit of non elastic putty between the scope and the barrel (leave a 1/32 space between them to prevent adhesion rebound) and you will have a witness to the maximum scope deflection toward the barrel. 

Edited by Graysteel
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "Scope flexing??"
Subject Author Forum Replies Last Post
CZ 527 SCOPE/ NO SCOPE? JAMINGRIZZ Rifle Scopes 16
what makes a scope a shogun scope? axaviere Shotgun / BlackPowder Scopes 5
Scopes, Scopes, and More Scopes! Ernie Bishop Rifle Scopes 3
Bushnell Elite Spotting scope question? bergbennett Spotting Scopes 1
Cricket Bullpup Scope Mark2Cars Rimfire / Airgun 0
Need advice and new scope wolverine3759 Rifle Scopes 16
Info needed on old Wollensak 4x scope Squirrel Pizza Target 0
Old Redfield Scope Help kevrog1987 Rifle Scopes 4
Affordable long range scope options Mouse Rifle Scopes 5
Help me scope a Forbes 24B R H Clark Rifle Scopes 0


This page was generated in 0.188 seconds.