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PostPosted: Tue May 10, 2011 9:12 pm 
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Joined: Sat Jul 14, 2007 11:45 am
Posts: 2099
Location: Southern Ontario
This is the first time I've set up a rifle/scope for non-PAL FT and I've run into a problem I haven't had before.
I have run out of clicks on my elevation turret.
With the clicks maxed out I am ok (just) at 10 yards, but will run out of clicks once past 20 yards or so.
The scope is mounted about as low as I can get it.
Is there any way to correct this? I'd like to be able to use clicks from 10 yards to 35 if possible.
The rifle is an AT44 in .22 shooting 460 fps.
The scope is a Bushnell Legend 5-15x40.
Thanks


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PostPosted: Tue May 10, 2011 9:17 pm 
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Location: Coalmont BC
Shim the rear of the scope up or buy an adjustable mount or one intended for droop....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Tue May 10, 2011 10:39 pm 
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Joined: Tue Oct 25, 2005 11:03 pm
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Location: home of the Marshville Festival, Ontario, Canada
Start with about a 0.015" to 0.020" shim at the rear scope ring.
Cut the shim in the shape of an "M" with the two outer legs joined - essentially forming a square, with a "V" shaped cutout in it.
The point of the "V" should be pointed to the rear of the gun when laid into the lower rear scope ring, and the wider end facing forward.
This will reduce the stress on the tube of the scope, preventing a kink in the tube.


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PostPosted: Wed May 11, 2011 12:36 am 
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Joined: Sat Jul 14, 2007 11:45 am
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Location: Southern Ontario
Thanks guys.
Any recommendations on what to use for a shim?


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PostPosted: Wed May 11, 2011 4:26 am 
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Posts: 338
Location: niagara
I like to use these rings from RWS whrn I am in a situation like yours. They are adjustable for windage and elevation and will get you very close to optical centerpoint.
http://www.specialtyshootingsportsoutdo ... d_361.html


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PostPosted: Wed May 11, 2011 11:28 am 
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Location: Southern Ontario
Pumpmaster wrote:
Thanks guys.
Any recommendations on what to use for a shim?

I've used soda cans for making shims.. Strong and thin enough material to be useful .. easy to cut to shape with normal scissors and certainly easy to obtain.. :mrgreen:

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PostPosted: Wed May 11, 2011 12:25 pm 
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Location: Southern Ontario
Parker_101_ wrote:
Pumpmaster wrote:
Thanks guys.
Any recommendations on what to use for a shim?

I've used soda cans for making shims.. Strong and thin enough material to be useful .. easy to cut to shape with normal scissors and certainly easy to obtain.. :mrgreen:

Thanks, that seems to be the most commonly used material for making a shim that I've found. Since I don't drink pop I'll have to go through the neighbours recycling bin in the morning :lol:


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PostPosted: Wed May 11, 2011 12:28 pm 
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Location: Rocky Mtn Hse Alberta
if you can get a 10yd sight in, how can you not get it sighted at 20yds?

should it not need turning down from the 10yd setting?

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PostPosted: Wed May 11, 2011 1:03 pm 
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Location: Coalmont BC
Quote:
should it not need turning down from the 10yd setting?

Not according to Chairgun on a 460 fps gun.... In addition, the OP wants to be able to use clicks out to 35 yards, which at 460 fps with a pellet of BC 0.024 requires an additional 53 clicks according to Chairgun....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Wed May 11, 2011 1:21 pm 
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Location: Rocky Mtn Hse Alberta
rsterne wrote:
Quote:
should it not need turning down from the 10yd setting?

Not according to Chairgun on a 460 fps gun.... In addition, the OP wants to be able to use clicks out to 35 yards, which at 460 fps with a pellet of BC 0.024 requires an additional 53 clicks according to Chairgun....

Bob


well I'll beef hooked.

would never dreamt that could happen.....

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Walter


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PostPosted: Wed May 11, 2011 1:24 pm 
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Location: Coalmont BC
Quote:
well I'll beef hooked.

Don't feel bad, Walter.... I had to run the numbers three times just to be sure.... :rolleyes:

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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PostPosted: Wed May 11, 2011 7:10 pm 
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Joined: Sat Feb 28, 2009 12:28 pm
Posts: 641
Bob is'nt there some way to get that gun to shoot flatter? :D
Some people use old film negative for shim,and i have used plastic from yogurt containers and it worked ok...kelly


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PostPosted: Wed May 11, 2011 10:22 pm 
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Joined: Sat Jul 14, 2007 11:45 am
Posts: 2099
Location: Southern Ontario
I'm going to go ahead and try a shim, hopefully that'll give me enough adjustment to allow me to click up to 35 yards.
I haven't set up a rifle shooting such a low velocity before so I scratched my head a few times while running numbers too :roll:


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PostPosted: Wed May 11, 2011 10:43 pm 
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Joined: Fri Aug 24, 2007 9:21 pm
Posts: 2102
Location: Greater Napanee, ON, Canada
My chart shows a drop of 2" from 28 to 35 yards. The high point of my trajectory is 16 yards and it is 3.22" lower at 35 yards. That is shooting .177 JSB heavies at 490fps.

Shooting at 35 yards on a white paper target, I can see the pellet first go above line of sight and then drop onto the target. Rainbow!

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