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ANOTHER scope mounting headache

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/21/2004 at 16:08
new pig hunter View Drop Down
Optics GrassHopper
Optics GrassHopper

Joined: August/27/2004
Status: Offline
Points: 25


on another thread ("help with scope mounting") I mentioned serious scope misalignment problems with my lever action.


Well, on this beautiful and sunny SoCal Sunday I got around to seriously sighting-in my brand-new Howa 1500 in .30-06.  I hadn't done this yet.  I've been messing around with the lever action, using it for testing & practice & learning.


So, doing what I'd hoped would be the "right tasks" I installed brand-new Leupold base and Weaver-style rings.  Then using ranburr's method from the other thread, I lapped the rings using a 1" diameter steel rod and fine-grit lapping compound.  I cleaned everything, then mounted a Leupold Vari-X II scope, and centered the reticles.  So far so good, I reckon.  No surprises, everything seems just fine.


Then I marked off a measured 13 yards.  My pal says his favorite gunsmith always uses 13 yards for that initial bore-sight distance, so I'm using too.  I then set up a small table and a Caldwell "Steady Rest," then inserted the laser boresighter into the Howa muzzle.  I turn it on, rest the rifle gently into the rest, line up the scope crosshairs on the bullseye...... and the laser dot is 4 inches below the crosshairs !!


I crank away on the vertical reticle adjust.... and run out of "adjust" long before the red dot is anywhere close to the bullseye.  SHEESH, why me ??


So I quit whining long enough to make a 0.030" shim out of brass sheet stock, loosen up the ring screws, insert the shim under the scope tube (on top of the ring), so now the aft end of the scope is higher.  I gently tighten the screws just enough to hold the scope in-place.  I re-center the vertical reticle adjustment, set up on the rest again, get the scope crosshairs on the bullseye......


And Voila, the red dot is now at bullseye level !!  And with just the tiniest bit of adjustment of the reticle adjustments, the scope crosshairs and red laser dot were both coincident on the bullseye.  Success.


What have I learned ??  That if I had a decent machine shop I could mill-down the front base, instead of shimming-up the back end.  By doing this I could "fix" the bases and avoid shims altogether.  But I don't, so I won't.

  So I now have a setup that works.  Now to get out to the range for actual shooting.


Once again, I'd sure appreciate thoughts and opinions on this topic of misalignment.






Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/22/2004 at 08:41
Dale Clifford View Drop Down
Optics Jedi Knight
Optics Jedi Knight

Joined: July/04/2004
Location: United States
Status: Offline
Points: 5087
One of the advantages of one piece mounts is that of shimming, since it lifts the entire assembly at one time and retains the relationship of the rings-scope. An easier way to bore sight and much faster is to place something like a 1" target dot (red with sticky on the back)  on a wall and simply take out the bolt  and at about 15-20 yds. place the gun on something solid (shooting rest, big pillow) look through the bore until it is centered on the red dot then adjust the cross hairs to the target. If this is done during the initial mounting it saves a lot of time and adjustments.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: November/24/2004 at 01:33
gozarian View Drop Down
Optics Apprentice
Optics Apprentice

Joined: April/04/2004
Location: United States
Status: Offline
Points: 158
New pig hunter, after years of doing what you are now doing, I now just pull the bolt and bore sight right through the barrel.  I do this at ranges from 25 to 1000 yards and it works great.  Just make sure you have a solid rest and turn your adjustments in the opposite direction.  I'd maybe try a different set of bases too before I did something drastic.  I recently put on a pair ot those new Tally lightweight aluminum one piece base/ring combinations on a model 700 Ultra Mag and they are heavy duty, light weight and  lined up perfectly.
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