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Posted: 10/30/2015 4:19:59 PM EDT
| Something weird happened to me at the range yesterday. I bought a new scope for my Ruger SR762 and went to sight it in. Well, I have a Led Sled that I use to securly hold the rifle, to try and eliminate user error. My groups were vertically stringing. About 3-4 inches long, but straight up and down, I mean a straight line. This rifle in the past from a bipod or bags will shoot MOA or less, with the same ammo I was using yesterday. I did some research today and found that sometimes shooting from a sled, it will not allow the rifle to move straight back upon firing and the muzzle will rise instead, causing vertical stringing. I am going to go back and shoot from a bipod, but I am pretty sure this was the problem. Anybody else ever hear of this? |
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I often see this when sighting in a new optic. I'll make adjustments and it will not move until firing (sticks) especially with a new optic/rds. I've found I have to "left/right" the windage after vertical adjustment to free it up.
Don't know if this helps you, but if you are using a new optic, give it a try. |
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Parallax not set for the range you are shooting?
Loose scope base or rings? What type of ammo are you using, ball ammo sucks for groups? I haven't used a lead sled, so I can't comment on them. Stringing up and down is almost always a function of the stock not being in the same rear position every time the rifle is fired. I use a rabbit eared rear bag and adjust elevation by moving the bag forward or aft until the crosshairs are in perfect stress free alignment with the bulls eye. Trying to steer the rifle during firing causes flyers. |
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Rifle is all good. Went to the range yesterday and shot it from a bipod. After a small windage adjustment, 3 shots in a nice cluster, in the X.
As best I can figure, the sled was not letting the rifle recoil back, just up, and that was causing the vertical stringing. |
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Recoil should have nothing to do with it, as the bullet has already left the barrel before any recoil happens.
My guess, as I said, is that a "windage" adjustment loosed/freed up the vertical adjustment (as I've said, it is common for it to stick). Many people think that recoil has an impact on zeroing. It does not. Bullets leave the barrel before any such recoil happens. |
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Quoted:
Recoil should have nothing to do with it, as the bullet has already left the barrel before any recoil happens. My guess, as I said, is that a "windage" adjustment loosed/freed up the vertical adjustment (as I've said, it is common for it to stick). Many people think that recoil has an impact on zeroing. It does not. Bullets leave the barrel before any such recoil happens. The rifle was grouping normal from the bipod, no more verticle stringing, before I made the windage adjustment. |
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