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post #1 of 9 (permalink) Old 11-27-2009, 11:08 AM Thread Starter
 
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trouble sighting in new scope - Remington 870

I've got a Remington 870 Express with a 24" cantilever barrel and a 2-7x32 scope. (same one that comes with the combo)

At 25 yards it was shooting about a foot to the left. I tightened down the horizontal adjustment and it moved right. Kept going, moved more towards center, but I'm out of thread, still way off - I have to tighten with my leatherman at this point and any more'll start stripping the knob. Is there anything else I should be trying to adjust?

The screws attaching the scope to the cantilever part of the barrel are plenty tight. I'm getting consistent groups, but they're consistently off the same amount.
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post #2 of 9 (permalink) Old 11-27-2009, 11:41 AM
 
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I had a scope that did the same thing once, for me it turned out that my crosshairs were stuck, well that's what i was told anyway..
A small arms expert in the Army was on hand at the range and tapped "LIGHTLY" on the adjuster caps of my scope
using the handle end of a screwdriver to free the crosshairs.
It worked and so far I've never had that problem ever again with that scope.
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post #3 of 9 (permalink) Old 11-27-2009, 11:45 AM
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I'd recommend professional scope intallation. If not, then use Loctite, but you'd be better knowing what you're doing because you may apply it wrong and it wouldn't hold, yet at the same time you'd have to replace screws or the whole scope (that's what professonal is for, and it is not expensive).

Good weaver rings is essential too. Scope needs to be boresighted (professional gunsmith will do it in the process of installation to insure correct installation).
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post #4 of 9 (permalink) Old 11-27-2009, 01:07 PM
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Quote:
Originally Posted by MrFox View Post
I'd recommend professional scope intallation. If not, then use Loctite, but you'd be better knowing what you're doing because you may apply it wrong and it wouldn't hold, yet at the same time you'd have to replace screws or the whole scope (that's what professonal is for, and it is not expensive).

Good weaver rings is essential too. Scope needs to be boresighted (professional gunsmith will do it in the process of installation to insure correct installation).
add in range time to make sure its on.
post #5 of 9 (permalink) Old 11-27-2009, 02:44 PM Thread Starter
 
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Thanks for the replies. I finally removed the scope from the cantilever arm and discovered that the arm was seated improperly.

After removing the two hex bolts holding the arm on the barrel, I found some dried-on stuff (sealant?) between the arm and the receptacle. After scraping it clean, re-seating it and re-tightening everything, it now is shooting 5-inch groups at 25 and 50 yards. Bloody hell Remington, how 'bout some quality control?

(Though to be fair, I should've checked the cantilever arm before trying to sight it in the first time.)
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post #6 of 9 (permalink) Old 11-27-2009, 07:22 PM
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5 inch groups at 25 and 50 yards...whats slugs are you shooting? But atleast you got your problem fixed.
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post #7 of 9 (permalink) Old 11-27-2009, 07:27 PM
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As Bruce stated, I had a scope like that before and now when I adjust it I lightly tap the scope a few times top/middle/bottom and never had a problem afterwards.



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post #8 of 9 (permalink) Old 11-27-2009, 11:40 PM Thread Starter
 
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I was shooting winchester slugs for most of the process, then remington at the end. The last round of shots, with the 5-inch group, was with Remington sabot rounds.
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post #9 of 9 (permalink) Old 11-27-2009, 11:41 PM Thread Starter
 
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tried the tapping thing as well, but with the other factors at work, no idea how much was one thing and how much was the other.
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