The Original CZ Forum
CZ LONG ARMS => CZF RIMFIRES => Topic started by: 455shooter on June 22, 2017, 10:30:53 PM
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I have a 455 American that was shooting quarter size groups at 50 yards from a bench resting on my shooting bag, using cheap Federal ammo. I put a bipod on it and started shooting CCI Mini Mags, but now I can't hold any kind of a group. Even after going back to the cheep ammo that was grouping OK, I still can't seem to get decent groups. That leads me to believe the issue is somehow related to the bipod (it's the type that attaches to the sling stud). Has anyone had a similar experience or have any suggestions?
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CCI MiniMag (HiperVelocity) aren't accurate than the high or standard velocity. The same it's when you use ?guila Supermaximun (HiperVelocity) and super extra (high velocity).......... If you returns the first ammo, should be accurate like before.. I think bipod isn't the problem.. but... I have no idea where the issue can be..
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Are you using a scope? A loose screw has drove me nuts more than once.
I take bipods off and on all the time never run into issues, but there is always a first time. Shoot a few groups without it and see what's up.
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Did you take the bipod off and go back to the bag rest when using the Federal ammo again?
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Second on the scope, happen to me once.
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Are you using a scope? A loose screw has drove me nuts more than once.
I take bipods off and on all the time never run into issues, but there is always a first time. Shoot a few groups without it and see what's up.
I am using a Cabela's .22 BDC scope. I did verify that all of the screw's were tight (I learned that lesson during deer season many years ago).
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Did you take the bipod off and go back to the bag rest when using the Federal ammo again?
I did not do that yet. That will be my next move.
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CCI MiniMag (HiperVelocity) aren't accurate than the high or standard velocity. The same it's when you use ?guila Supermaximun (HiperVelocity) and super extra (high velocity).......... If you returns the first ammo, should be accurate like before.. I think bipod isn't the problem.. but... I have no idea where the issue can be..
Enviado desde mi XT1095 mediante Tapatalk
The CCI Mini Mags are rated at 1260 FPS at the muzzle. This high velocity ammo runs at about the same speed as the Federals that I was using, so I expected similar results. I'll try removing the bipod and get back to where I was and hopefully the accuracy well return.
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CCI MiniMag (HiperVelocity) aren't accurate than the high or standard velocity. The same it's when you use ?guila Supermaximun (HiperVelocity) and super extra (high velocity).......... If you returns the first ammo, should be accurate like before.. I think bipod isn't the problem.. but... I have no idea where the issue can be..
Enviado desde mi XT1095 mediante Tapatalk
The CCI Mini Mags are rated at 1260 FPS at the muzzle. This high velocity ammo runs at about the same speed as the Federals that I was using, so I expected similar results. I'll try removing the bipod and get back to where I was and hopefully the accuracy well return.
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Sorry, you are correct.... I was talking about the CCI stinger..
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Check to make sure your barrel is still free floated. The action is known to be wiggly in the 455 guns. If you were messing with the stock, you could now have it in a position the gun doesn't like and it's either loose or has the barrel wedged against the stock. Run a dollar bill from the front of the stock back to the receiver. It shouldn't hang on anything or get tight. Also make sure your receiver/action does not move in the stock.
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Check to make sure your barrel is still free floated. The action is known to be wiggly in the 455 guns. If you were messing with the stock, you could now have it in a position the gun doesn't like and it's either loose or has the barrel wedged against the stock. Run a dollar bill from the front of the stock back to the receiver. It shouldn't hang on anything or get tight. Also make sure your receiver/action does not move in the stock.
Thanks for the suggestion. I'll take a look.
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Check to make sure your barrel is still free floated. The action is known to be wiggly in the 455 guns. If you were messing with the stock, you could now have it in a position the gun doesn't like and it's either loose or has the barrel wedged against the stock. Run a dollar bill from the front of the stock back to the receiver. It shouldn't hang on anything or get tight. Also make sure your receiver/action does not move in the stock.
Thanks for the suggestion. I'll take a look.
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Well, I think the issue has been resolved. I did run a dollar under the barrel, and although it slid through, it seemed a little more snug than it should have. I loosened the bipod a little and it appeared that I could slid the bill through a little more smoothly. I then snugged up the bipod just enough and then went to the range. The accuracy came back!!! I can't really explain how the bipod being overly tight would cause the issue, but apparently it did.
Thank you all for your input! Stay safe and happy shooting!
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Glad you found it. That one is a little strange, but it sounds like you just barely had enough clearance without the bipod and lost it with it. If it goes South on you again, remove some of the stock material in the area where the bill is tight. No need for it to be tight. This will keep the problem from showing up unexpectedly in the future should the stock take a set in the wrong direction.
Nothing surprises me about small details affecting accuracy in a .22 rifle. They are very demanding. More than a centerfire in my opinion. Pistols are easier. :) :)
Joe
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Glad you found it. That one is a little strange, but it sounds like you just barely had enough clearance without the bipod and lost it with it. If it goes South on you again, remove some of the stock material in the area where the bill is tight. No need for it to be tight. This will keep the problem from showing up unexpectedly in the future should the stock take a set in the wrong direction.
Nothing surprises me about small details affecting accuracy in a .22 rifle. They are very demanding. More than a centerfire in my opinion. Pistols are easier. :) :)
Joe
I will take that under advisement. What I find perplexing, is that the bipod attaches to the sling stud which does not contact the barrel. But like you stated, if I have some of the stock under the barrel removed, it would create the necessary "cushion" needed.
Thanks for the input, Joe!
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Rifle harmonics are a weird thing. The bipod must've distorted the stock by just a few hundredths or thousandths of an inch and messed up the synergy of everything. Strange things happen!
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Rifle harmonics are a weird thing. The bipod must've distorted the stock by just a few hundredths or thousandths of an inch and messed up the synergy of everything. Strange things happen!
This.
I am an engineer. I look at a heavy barrel .22LR rifle like my Savage BTSV, then look at the tiny cartridge, and my first thought is that tiny little cartridge isn't going to excite that heavy barrel very much at all. Then I read about barrel tuners, free float, action torque, etc. and got a few thousand rounds down range and decided that a .22 was the most challenging of the long guns.
Joe
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Rifle harmonics are a weird thing. The bipod must've distorted the stock by just a few hundredths or thousandths of an inch and messed up the synergy of everything. Strange things happen!
That is the only thing that I can come up with that would have caused my issue. I had it so tight that the weight of the rifle sitting on the bipod caused a slight twist in the stock, possibly resting it against the barrel. Depending on the amount of weight exerted on the bipod, the point of impact changed. It wasn't a lot, but enough. I now have a new respect for these harmonics.
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Rifle harmonics are a weird thing. The bipod must've distorted the stock by just a few hundredths or thousandths of an inch and messed up the synergy of everything. Strange things happen!
This.
I am an engineer. I look at a heavy barrel .22LR rifle like my Savage BTSV, then look at the tiny cartridge, and my first thought is that tiny little cartridge isn't going to excite that heavy barrel very much at all. Then I read about barrel tuners, free float, action torque, etc. and got a few thousand rounds down range and decided that a .22 was the most challenging of the long guns.
Joe
I watched a few videos on adjusting the action screw and it's amazing how a few pounds here and there can affect the point of impact. Apparently, this holds true with any exertion on the stock.
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Heres a simple but true rule....until you use good match ammo you wont get any kind of repeatable target accuracy, high velocity is fine for hunting when 1 1/2" groups will take game at 50 yards and in but I havent seen any benchrest shooters using mini mags
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Heres a simple but true rule....until you use good match ammo you wont get any kind of repeatable target accuracy, high velocity is fine for hunting when 1 1/2" groups will take game at 50 yards and in but I havent seen any benchrest shooters using mini mags
My primary focus is to get the accuracy necessary for humane shots on small game, typically inside of 50 yards. I've never been accused of being a bench rest shooter. ;-)
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