N/A Scope mistery.

[Emu]

I was trying best scope on my Sidewinder .30 for a hunting I will go on next days.

With one of the scopes (a West with beautiful reticle) that works well on my Uragan .22 the Sidewinder shoots really bad. I mounted back the scope it used to have and the rifle is perfectly accurate, with pellets holes touching at 50 yards.

Why the scope that works on the Uragan .22 does not work at all on the Sidewinder?

Explanations are welcome for me to learn.

 

[MongooseV8]

Have you tried other scopes on your Sidewinder? If a scope holds zero on one rifle and not another, there are really only 2 reasons I can think of. Either the scope has a failure of some kind, or there was an issue with mounting on the second rifle. Sometimes rings can be difficult to find the issue, and the scope will move a tiny bit from shot to shot.

 

[Gerry52]

Have you remounted the West scope on another gun you know to be accurate & tested results? That IS a mystery. I had trouble with my Hawke Sidewinder scope after my gun took a fall & it took 2 hours of trial & error only to find a tiny pebble was keeping the Jaws of the scope ring from seating properly. If it's accurate on one gun it should be on another. That is strange.

 

[nervoustrig]

Can the poor accuracy be described as mostly vertical stringing or horizontal stringing?

 

[Emu]

Can the poor accuracy be described as mostly vertical stringing or horizontal stringing?

I do not notice rings to be loose nor a failure in the mounting.

With the west scope the partern varies at 50 yards within a circle the size of the double of a golf ball. With the other scope the pattern of the group easily is within the circle the size of a quarter.

The same west scope is very accurate with my Uragan .22.... Mounted with the same rings.

 

[beerthief]

is the rifle accurate with different sighting options ? another scope or irons or red dot ?

 

[XSUltimate]

As mentioned earlier, the mount or the scope are really the only possibilities. Now having said that, I imagine the 30 cal has a more significant recoil from the shot than your 22 does. The additional recoil may be affecting the stability of the scope/reticle. You may also now see a wider group from your 22 when mounted if there has been any permanent damage or change to the scope from shooting while on the 30.
Thx
Dan

 

[beerthief]

so the scope is a quarter size group on the uragan and 3 inch group on the sidewinder , but still centered on poi right ?

 

[Emu]

so the scope is a quarter size group on the uragan and 3 inch group on the sidewinder , but still centered on poi right ?

With the Uragan .22 with the west scope at 50 yards the pattern of the groups are the same hole. Super tight.

With the Sidewinder .30 with the west scope at 50 yards the pattern of the groups are a circle the double of the size of a golf ball.

With the Sidewinder .30 using other scopes at 50 yards, the pattern of the groups are smaller than the circle of a quarter coin.

 

[beerthief]

put the scope back on the .22 and use other scope on the .30 or buy another scope , that's what i would do

 

[nervoustrig]

My question about vertical vs horizontal stringing was in consideration of a change in the gun’s center of gravity. Meaning, maybe the second scope shifts the CoG enough to make the gun respond differently to the impulse of firing (e.g. more muzzle flip). In which case the dispersion on target would be predominantly vertical.

However if the groups are mostly circular or random in shape, that theory isn’t very likely.

 

[Emu]

My question about vertical vs horizontal stringing was in consideration of a change in the gun’s center of gravity. Meaning, maybe the second scope shifts the CoG enough to make the gun respond differently to the impulse of firing (e.g. more muzzle flip). In which case the dispersion on target would be predominantly vertical.

However if the groups are mostly circular or random in shape, that theory isn’t very likely.

But it should be something related with the ricoil and the effect it has in the movement of the rifle with the weight of that particular scope.

 

[Vana2]

Strange.

Maybe the scope is affecting the balance, ...it's the only other thing that I can think of.

My Element Helix is fine and stable on my Crown but the same scope (mounted higher) on my Impact causes it to tip and I really have to watch the bubble level or I get canted shots opening up the group.

 

[Jasonmc]

I have experienced this...same scope I could shoot great on a compact rifle... Not worth a crap on a longer rifle... No matter the compact I tried the scope on I could shoot well but not on a longer rifle... Put a longer scope on the longer rifle and I could shoot it just fine... I'm guessing I held it so differently to get a good sight picture it had to be uncomfortable and I wasn't accurate with it. Just because the scope looks good on a certain rifle doesn't mean we can shoot it good... At least that's my experience