scope unlevel (cant)

[Cassman]

I mounted a scope on my gun, don't have a high dollar level, just normal level from hardware store,,put gun in vice got it level, mounted scope got it level...go sight it in 100yards...dead on bullet in bullet,,,,
go to 300 yard target,, shoots 3 inches to the right...let friend shoot,,,make sure its not me,,,same place 3 inches right,,,,so I been reading and I believe that my scope and gun are not perfectly level to each other....scope cant its called... so which way do I need to move my scope if im standing at the butt of gun(stock) looking at scope....left or right?

 

[DENWA]

3" at 300 yds would be a bit of cant.
I would recommend you take a 4 foot level at 100Yds and put your rifle in a vice.

see if the cross hairs align with the level.
If they are straight then I'd look a load stability, as I have seen this before with factory ammo

 

[jimbires]

https://www.longrangehunting.com/articles/reticle-perpendicularity.34/

another article you might be interested in reading .

https://www.longrangehunting.com/articles/how-canting-your-rifle-affects-long-range-accuracy.124/

 

[Deputy819]

mounted scope got it level.

Did you make sure the reticle was "plumb" after leveling the rifle?

 

[ShtrRdy]

3" at 300 yds seems like a lot of impact shift due to cant. Could there be wind anywhere along the path of the bullet that could have pushed it?

 

[Cassman]

Did you make sure the reticle was "plumb" after leveling the rifle?

it looked level when I looked thru scope...but apparently it was not...

 

[Cassman]

3" at 300 yds seems like a lot of impact shift due to cant. Could there be wind anywhere along the path of the bullet that could have pushed it?

just a slight wind

 

[DUSTY NOGGIN]

3" at 300 .. you would be able to tell with just your eyes

it may be off a little .. but it also must be something else

 

[DUSTY NOGGIN]

if its dead on center at 100 .. your scope must be sitting on the rifle to the left of centerline .. in order to cross the path at 100 .. still moving to the right

both of those problems i think you would be able to see without use of any tools

 

[Hatrick]

Hang a 1/2" white rope at 100 and level your rifle and check plum on the weighted rope.

 

[Bigeclipse]

Hang a 1/2" white rope at 100 and level your rifle and check plum on the weighted rope.

this x2.

 

[Bravo 4]

If it were just wind, it would take around 10 mph full value to blow it off 1 moa (with most bullets at reasonable speeds). That shouldn't go unnoticed.

 

[BountyHunter]

To check at 100 it is called the tall target test and pretty easy to do. It also allows you to check the exact distance each click really is on your scope vs what the mftr says it is. They are routinely off and you dial the wrong elevation and think something is wrong with your data, no the scope clicks are not what they say. Just google tall target test.

 

[ShtrRdy]

If it were just wind, it would take around 10 mph full value to blow it off 1 moa (with most bullets at reasonable speeds). That shouldn't go unnoticed.

For my .308 Win it only takes 5 mph full value wind to move it off 3" at 300 yards. ( according to my ballistic program )