Firearm & Gun Forum - FireArmsTalk.com > Long Guns > General Rifle Discussion > Can one brand of ammo be inaccurate compared to another brand?

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Old 11-03-2012, 04:30 AM   #11
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Originally Posted by Txhillbilly View Post
Anytime you change the ammo that you shoot,the point of impact will usually be different from where you have your scope zeroed with the original ammo that you sighted the gun in with.
That part I've learned to understand, but with Federal, I'm finding that I can't even get the shots to be consistent in terms of placement. It's frustrating to think you made all the scope adjustments and should be spot on, only to have a shot not go in the bullseye.

I did not have that issue with Winchester Super X, so even though it costs more, I will get that brand from now on.

For the life of me though, I just did not expect a brand to vary round to round, which is what I think may be happening.
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Old 11-03-2012, 04:32 AM   #12
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Here's the problem I've been finding with Federal lately, even the alleged "target" ammunition. The rounds are not concentric. They vary as much as 0.009" out of concentricity. So, from round-to-round, you can't get good grouping as the bullets get deformed by the forcing cone as the bullet goes into the barrel.

I was attempting to sight in a .308 and would get three on top of each other, one an inch away and another up to three inches from the group - in all different directions. The inconsistency was all due to the ammunition concentricity.
It something I honestly never would have expected. Shot by shot variation.

I appreciate you sharing that info. I thought I was going nuts or had a bad scope or something, but it is a new Remington 700 ADL .270, and while the scope is sort of on the cheap side, I didn't want to think it was not working at all.

Hopefully, switching back to Winchester Super X will fix the problem and I'll be properly sighted and back in the bullseye.
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Old 11-03-2012, 04:40 AM   #13
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I will get that brand from now on.
That's an easy solution for now if you are happy with the results.

I still think that it is premature to place the fault on the Federal Brand.

Occasionally a manufacturer will recall certain lots due to non-conformance issues. At that point you would have cause.

Your box of Federal may perform superbly in another rifle.

Although it would be nice to know what ammo your rifle likes before you fire a shot, it won't happen.
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Old 11-04-2012, 01:11 AM   #14
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I'm going to snag 4 boxes of Winchester Super X for each of my rifles - the .270 Win and the 300 WSM, shoot 2 of them each to make sure they are zeroed in and shooting accurately, then keep the other 2 boxes of each and set them aside for future use, when accuracy counts most. Same lot, hopefully it will increase the chances of all working as expected.

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Old 11-05-2012, 12:32 AM   #15
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If you want to get really OCD about it, take a micrometer to each bullet before firing and record the results...
sometimes there will be differences in width in the same box...in bullet or case...crimp...

and indeed, through much testing I often wonder if MFR's send factory seconds to Walmart...
I know 7-Up used to do it, wonder if everyone else does too...

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Old 11-05-2012, 12:45 AM   #16
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Originally Posted by buckhorn_cortez View Post
Here's the problem I've been finding with Federal lately, even the alleged "target" ammunition. The rounds are not concentric. They vary as much as 0.009" out of concentricity. So, from round-to-round, you can't get good grouping as the bullets get deformed by the forcing cone as the bullet goes into the barrel.

I was attempting to sight in a .308 and would get three on top of each other, one an inch away and another up to three inches from the group - in all different directions. The inconsistency was all due to the ammunition concentricity.

I came to that conclusion after sand bagging the barrel so it could not easily move, and finding the same type of grouping. I purchased a Hornady concentricity gage and started looking at the ammunition and found the average variance to be 0.005" - can't be accurate with that kind of variability.

After tweaking a box of 20 rounds to 0.002" max deviation, I got a 0.4-inch group at 100 yards.

While all of the suggestions so far can result in accuracy problems, with Federal ammunition, I'd look at concentricity or change to a different manufacturer.

The interesting thing is, I found three boxes of 30 year old Remington .270 about 2 weeks ago, and a friend and I checked that for concentricity and the WORST round was only 0.002 out of concentricity.

Most of the .270 rounds were 0.000 or 0.001 - that's the way they should be.
30 year old ammo, from back around the end of the high quality era. Now all the economics classes are taught to balance (i.e. compromise) between quality and profit.
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Old 11-05-2012, 03:08 AM   #17
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If you want to get really OCD about it, take a micrometer to each bullet before firing and record the results...
sometimes there will be differences in width in the same box...in bullet or case...crimp...

and indeed, through much testing I often wonder if MFR's send factory seconds to Walmart...
I know 7-Up used to do it, wonder if everyone else does too...
If the 8 boxes of Winchester Super X that I got at Cabelas (4 of .270 Win and 4 of 300 WSM) can't do the trick then I'm screwed.

Gonna zero both rifles in using that ammo and stick with that ammo. Hopefully it will reduce the chances of problems.

I'll set aside the rounds from this purchase that I didn't use to zero the rifles in so that in a pinch where accuracy is key, I can use those, as they should be from the same lot.

Appreciate all the feedback from folks here. It's been fun to expand my knowledge.
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Old 11-05-2012, 11:11 AM   #18
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I have always had better luck with winchester rifle ammo. Other brands are loaded hotter than winchester. Today a lot of Winchester ammo is not made by winchester. It's hard to say that you will always get better results from winchester ammo anymore.

I know with my BAR it doesn't matter what brand of ammo as long as the bullet is the same weight and type. This season I switched to Brown Bear I haven't noticed any difference in accuracy. The only difference I noticed was the steel cases are abrasive.

Accuracy is relative. I will shoot a less accurate round nose bullet if I know I am going to have to shoot into brush that certainly deflect a more accurate boat tail or ballistic tip.

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