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Vertical stringing and horizontal stringing, maybe head moving around. Many 10/22 stocks are designed for iron sight use, optics make it harder to maintain solid cheek-weld, higher mounted optics are worse yet. If the first fired groups started off well then following groups are worse there may be some shooter fatigue.
 
Lodi said:
Vertical stringing and horizontal stringing, maybe head moving around. Many 10/22 stocks are designed for iron sight use, optics make it harder to maintain solid cheek-weld, higher mounted optics are worse yet. If the first fired groups started off well then following groups are worse there may be some shooter fatigue.
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Thanks a lot! I didn't think about the head postion. I am using the X22 stock with a cheek riser.

Actually, I shot CCI first to get loose groups, and then used SK to get tight groups, and then CCI, that's why it is wierd. It looks like that my rifle doesn't like CCI, but when I used a sand bag and keep the rifle as stable as possible, the CCI could generate the groups like SK2 - with 1-2 fliers per 10 rounds.
 
elKrusto said:
Rifles have certain ammo that they like, and certain ammo they don't like. Yours doesn't like the cci? Try other brands.
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Yeah it also loves Eley benrest outlaw. I got nearly one inch group at 50m with 9 rounds, 1 flied away. RWS rifle match also worked. Considering the barrel is factory, it is great. CCI can occasionally reach 1 inch group at 50m, but usually the groups are open. I just didn't expect it to be that open at 25m. I cannot tell which targets are shot offhand when they are mixed up. There is something wrong with the shooter at least.
 
tulazhen said:
Thanks a lot! I didn't think about the head postion. I am using the X22 stock with a cheek riser.

Actually, I shot CCI first to get loose groups, and then used SK to get tight groups, and then CCI, that's why it is wierd. It looks like that my rifle doesn't like CCI, but when I used a sand bag and keep the rifle as stable as possible, the CCI could generate the groups like SK2 - with 1-2 fliers per 10 rounds.
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Stringing is usually the gun or the shooter but not ammo. Large groups can be the ammo but also the gun or shooter. Parallax might be in play at the closer distances. A too low cheek rest can allow the head to move around too much.
 
Shooter bias can be a thing too, not trying very hard when you know you're shooting cheap ammo but doing your best when you're shooting the expensive stuff and knowing that anything less than bullseyes is on you. Trying for the same focus per shot keeps it even and is good practice.
 
Thanks for all!

Update

I tested yesterday to confirm that

(1) CCI standard velocity ammo was accurate through another rifle (10 rounds within 3 cm at 25 meters, elbows on table with no support, open sights)

(2) SK ammo was accurate through Ruger 10/22 (8 rounds within 2 cm at 25 meters, 2 fliers, elbows on table with no support, 12x scope)

(3) CCI standard velocity not only showed poor accuracy through Ruger 10/22, but the POH moved to the left compared to other ammo.

It bascially repeated the first test.

Perhaps the barrel doesn't like CCI. The same happened to CCI blazer, but if I recall correctly CCI minimag is a little better.
 
You're not going to be consistent with 'elbows on the bench', just 'some good - some not'. Stick with using front & rear bags or a bipod/bag or a sled if you want to see how accurate the gun it. Elbows is for how accurate YOU are.
 
Jahnj0584 said:
Please tell me this is with irons and you are relatively new. Shoot 1000rds of CCI with intent until you can get under 1" at 25y.
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Could be bedding issues. I found that the single mounting, did allow for the action to rock in the stock.

I just had mine out, 8 shots 1/2" at 50. I just recently bedded and free floated it.
 
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