Scope issue

SignGuy

SignGuy

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ok recently tried sighting in a scope on my 303 brit sporter monstrosity
and found that the lowest i can get the POI is 8" higher then the POA
at 50 yrds i have run out of ideas shy of springing for a new scope
the scope in question is a bushnell sportsmen 3-9x40 yes i know its a bargin bin scope but its all i could afford but one would think that i could at least get on paper with it any thoughts
 
Try adding some shim material to the rear scope base. You don't mention what type of 303 you have. It could be one of several different types. I've had similar problems with No1 mk3 an No4 mk1s and their variants. Normally the scope bases are one piece affairs that are only held on with one screw on the rear mounting point. Be careful when you add the shim to make sure that the whole setup is tight, as these mounts usually cause quite a bit of trouble down the road. If it's a P14 then it probab;y has had the rear sight ears milled off and to much material has been removed, these are a lot easier to deal with, and adding shims is a snap. bearhunter
 
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bearhunter said:
Try adding some shim material to the rear scope base. You don't mention what type of 303 you have. It could be one of several different types. I've had similar problems with No1 mk3 an No4 mk1s and their variants. Normally the scope bases are one piece affairs that are only held on with one screw on the rear mounting point. Be careful when you add the shim to make sure that the whole setup is tight, as these mounts usually cause quite a bit of trouble down the road. bearhunter
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its a no 4 mk 1 i think, its the one with an adjustable bolt head and yeah the one peice base that is screwed on to where the old flip site used to be is what i have i'll see if i have a pic of it handy as far as shimming it i am not sure the rear mounting point has a screw thru each side of the base

heres one pic i will add another one later thats a little closer up
camo2.jpg

scopemount003.jpg

scopemount002.jpg

scopemount001.jpg
 
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RobertMcC said:
Who makes that stock?
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not sure its wood came with it when i bought it i assume when globe firearms sported it they added it the camo job is done by me though
and no i wont do anyones cause i suck at all painting let alone camo lol
 
Where the mount fits close to the charging bridge, is there a wedge of some kind that is held in with a bolt from the top of the mount into the action?
If so, try adding a little piece of a popcan (or shim stock) to the underside of the mount to raise the front of the scope up. This should bring your POI down, and give you a little more adjustment from the scope.
Just out of curiosity, have you shot it at 100 yards or 200 yet? If so, what was the POI versus the POA?
 
havent had it out to 100 yrds yet and yeah theres a wedge thingy held to the mount by an allen screw i will shim that up and see if that helps any man they need to make this whole scope and zero thing less of a complication and more of a screw on and go thing lol
 
SignGuy said:
havent had it out to 100 yrds yet and yeah theres a wedge thingy held to the mount by an allen screw i will shim that up and see if that helps any man they need to make this whole scope and zero thing less of a complication and more of a screw on and go thing lol
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These rifles weren't really designed with scopes in mind so that sometimes leads to problems with scope/base/bore alignment and zeroing.

SKBY.
 
Splatter said:
The bolt head isn't adjustable. If your action closes with the bolt head unscrewed one turn, you need to see a gunsmith.
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adjustable meaning the head can be changed to one with more or less headspace
 
Gunrunner100 is right in his approach, my suggestion would have had you shooting higher. I've seen that mount before with similar problems, the only screw utilised in it is the rear sight retaining screw. Add the shim or shims to the front dovetail area. Now this shim has to be tight or it will fall out. You may even have to file (very lightly) some of the dovetail angle wall face to get it to raise, shouldn't do more than a few thousandths of an inch at a time, be very careful, don't get impatient, it will come out fine. With each minor fileing, remount the scope and shims, and boresight until it will show point of impact on the crosshairs through the bore. Oh I almost forgot, adjust the crosshairs to be in the center of the adjustment range. bearhunter
 
Splatter said:
The bolt head isn't adjustable. If your action closes with the bolt head unscrewed one turn, you need to see a gunsmith.
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The "bolt" in question goes from the top of the mount down to a wedge inside the action area by the charging bridge. Not the rifle bolt itself.
 
Start with the thinnest shim stock you can find, because at the mid-point, it will raise the objective up quite higher than if it was placed further forward.
 
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