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PostPosted: Mon Apr 04, 2011 1:09 am 
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Hey guys, I need some help. I just bought a new Bushnell Banner 6x-18x 50mm scope for my .177 co2 pellet gun (Crosman 1077) I use for target practice. I tried to get ruff centering before my official longer range zero in (50 or 75 yards) and I ran into a problem. It will shoot in the centre of the cross hairs at 8 yards but only with FULL elevation dialed. This leaves me with no leeway elevation for longer distances.
I don't get it.
Am I missing something? Do I need a new scope?


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PostPosted: Mon Apr 04, 2011 6:55 am 
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You will have to elevate the back of the scope somehow by shimming it or getting adjustable scope mounts or band the barrel upward a bit .
What is the real fps of your Crosman 1077 ?

http://www.google.ca/search?q=rifle+sco ... urceid=ie7

http://www.google.ca/search?hl=en&rlz=1 ... 1&aql=&oq=

viewtopic.php?t=10450&highlight=barrel+droop

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PostPosted: Mon Apr 04, 2011 10:26 am 
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I had the same problem with my scope, the gun was shooting way below the crosshairs, so I shimmed the rear ring with 2 or 3 layers of card stock. That was more than sufficient.

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PostPosted: Mon Apr 04, 2011 12:49 pm 
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Location: Calif
Scopes and mounts are NOT designed for CLOSE ranges.
You will have to shim the mount as was described above to zero at 8 yards.
I had a rifle/scope combo that would NOT zero at 10 meters. I had to go to adjustable mounts to be able to zero at 10 meters.

If you are going to shoot at 50 or 75 yards, use the 8 yard to zero only the windage. Your elevation zero at 50 yards will be VERY different. All you need to do is hit the paper at 8 yards.

Here is my method of long range zeroing.

First use a BIG backer behind the target, so you can see where you are missing the target paper to be able to adjust to get the hits on the target paper.

At 5 yards, first adjust the elevation so it is "anyplace" on the target paper, then adjust the windage to be close to target center. This is for gross adjustment, to get the scope pointed in the right direction. Don't laugh, I had rifle/scope/sight combos that were so far off that I NEEDED this close gross adjustment just to get on the paper, I was hitting the trap outside the target paper. Then adjust the elevation to be "anywhere" near the center of the target. You will readjust the elevation, so this is a gross adjustment, not a zero adjustment.

At 10 yards, adjust elevation so it is again "anywhere" near the center on the paper, again adjust the windage to be close to target center.

Repeat going out 10 yards at a time until you reach your desired range.

At your desired range, now ZERO both the elevation and windage.

This method keeps your pellet impact on the target paper as you move out in range, so you can figure out where you are hitting vs where you are aiming. If you go from 10 to 50 yards in one step, and you are missing the target at 50 yards, you won't know how to adjust the scope to get on target.

Now go backwards, but do NOT touch the scope adjustment knobs.
At 40, 30, 20, 10 yards, note the impact of the pellets vs where you are aiming. This tells you the flight path of the pellet and what to expect at the various ranges.

gud luk


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PostPosted: Mon Apr 04, 2011 8:50 pm 
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The shimmy idea sound good, I'm going to try it later tonight.

The Crosman 1077 is rated at 495-625 fps depending on what the laws are lol. I've never actually clocked it though.


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PostPosted: Tue Apr 05, 2011 12:49 am 
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I shimmed under the scope in between the back ring with 7 layers of photo film negative and it worked perfectly. Now my scope has 78% elevation to spare. :) Thanks!


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PostPosted: Tue Apr 05, 2011 6:56 am 
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joehasmoves wrote:
I tried to get ruff centering before my official longer range zero in (50 or 75 yards) and I ran into a problem.

If your Crosman 1077 is a detuned model for Canada, it is probaly shooting at about 400 fps tops .
So the pellet will drop a fair amount at 50 to 75 yards from line of sight .

http://www.arld1.com/trajectory.html

http://www.arld1.com/holdoverunderdonesteve.html

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PostPosted: Tue Apr 05, 2011 7:18 am 
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This begs the question...why such a high-powered scope for this gun?


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PostPosted: Tue Apr 05, 2011 7:16 pm 
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Seven layers of negative film.....that seems like a lot, you may want to take a few off.

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PostPosted: Wed Apr 06, 2011 11:30 am 
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ac12 is 100% right.
a 8yds Zero doesn't make any sens specially if the scope height is high.
download hawke chairgun pro and find out the best zero range for your setup.


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PostPosted: Wed Apr 06, 2011 12:17 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
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Location: Rocky Mtn Hse Alberta
joehasmoves wrote:
Hey guys, I need some help. I just bought a new Bushnell Banner 6x-18x 50mm scope for my .177 co2 pellet gun (Crosman 1077) I use for target practice. I tried to get ruff centering before my official longer range zero in (50 or 75 yards) and I ran into a problem. It will shoot in the centre of the cross hairs at 8 yards but only with FULL elevation dialed. This leaves me with no leeway elevation for longer distances.
I don't get it.
Am I missing something? Do I need a new scope?


welcome back Joe.

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PostPosted: Wed Apr 06, 2011 12:24 pm 
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lol...are you trying to put good ol' Joe in trouble?


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PostPosted: Wed Apr 06, 2011 12:29 pm 
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airgunfun wrote:
lol...are you trying to put good ol' Joe in trouble?


No, not at all. missed him and good to see he's airgunning again.

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PostPosted: Mon Apr 11, 2011 10:40 am 
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Location: Toronto Ont.
18x isn't a high power. Just puts you into the ballgame in hunter FT!!!!

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