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Shooting & Reloading - Mausers, Big Bores and others >> Rifles
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375Brno
.333 member


Reged: 18/10/05
Posts: 354
Loc: Brisbane, Australia
Factory ammo grouping
      #44397 - 19/12/05 10:50 PM

Hi

Recently bought a 3006 (BRNO 600) and took it out on the weekend to try it out on the benches. Not organised for reloading yet so it is factory ammo at this stage. The previous owner said that he had best results with Winchester 180 gr Silvertips and Remington 180 gr Core-lokt so I go out with a box of each. Fire a couple of rounds to warm things up and check the recoil - Hmmm a bit more than a 22 isn't it !!!

The Winchesters group into approx 1 1/4 inches at 100 yards and the five shots are about 2 inches to the left and 1 inch down. The Remingtons group into approx 2 inches (4 into an inch) and are 4 inches high and 1 inch to the right. Nothing fancy but given my experience and that they are factory loads I am OK with this. I then go thru the same exercise at 200 yards. The Winchesters group into approx 4 inches and are 4 inches left and 4 inches down and the Remingtons are 2 inches right and 4 inches high. Not as good as at 100 yards but it only has a 4x scope and I had a bit of trouble making sure I was holding onto the same point. Sorry but no chrono readings.

So I understand that if the Winchesters are 2 inches left at 100 then they will be 4 inches left at 200 and if the Remingtons are 1 inch right at 100 then they will be 2 inches right at 200. That makes sense but finally here are my questions.

1. Why does the Winchester drop 3 inches between 100 and 200 and the Remington does not drop at all. Is this something to do with velocity ?

2. I know that between the two types of ammo there will probably be different primers, different powder, different weights of powder, and different bullets but does it make that much difference given that the two groups are out by 3 inches horizontally and 5 inches vertically at 100 yards.

Searching for a simple answer but a complicated one will do if that is what it is. I just want to make sure that something abnormal is not happening here.

Thanks for taking the time to read the post.

Regards
375Fetish

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jro45
.300 member


Reged: 25/12/03
Posts: 192
Loc: DE, USA
Re: Factory ammo grouping [Re: 375Brno]
      #44407 - 20/12/05 02:15 AM

If a bullet is going fast enought it wouldn't drop at all from 100 yds to 200 yds but with a 30/06 I wouldn't think they would go that fast. As far as groups go different bullets group in different places. I just recently shot one of my rifles at 100 yds with two different bullets at pretty near the same volosity. One grouped about 3" higher than the other group. Different bullets can make a difference. Sometimes they all go to the same point of aim if you get two bullets that have the same flight design and same powder.

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375Brno
.333 member


Reged: 18/10/05
Posts: 354
Loc: Brisbane, Australia
Re: Factory ammo grouping [Re: jro45]
      #44492 - 21/12/05 08:37 AM

jro45

Thanks for that. It is what I thought but just wanted to make sure something strange was not happening.

Regards
375Fetish

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windhond
.224 member


Reged: 13/01/06
Posts: 1
Re: Factory ammo grouping [Re: jro45]
      #46540 - 13/01/06 08:47 PM

No bullet is fast enough not 2 drop between 100 and 200 yards, if u can get hold of that rifle i'll must het it !!!!!!!!!!!!11

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375Brno
.333 member


Reged: 18/10/05
Posts: 354
Loc: Brisbane, Australia
Re: Factory ammo grouping [Re: windhond]
      #46685 - 15/01/06 03:41 PM

windhond

What if it is still on it's upward trajectory as it goes thru 100 and then is coming down and is still on at 200. I do not know enough about the 06 trajectory to say that this is the case but I do know enough about physics to say that it is possible. If this was the case then it would be slightly high at 150.

375Fetish

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mlg
.275 member


Reged: 19/03/05
Posts: 85
Loc: Queensland, Australia
Re: Factory ammo grouping [Re: 375Brno]
      #46712 - 16/01/06 06:34 AM

375 Fetish

That both factory rounds group at all is what is important and your results indicate you have a good rifle. Those groups can probably be tightened considerably by handloading, but both groups are certainly good enough for general hunting.

I would now reset your scope to whichever factory round you decide to use (the Winchester groups a little better) so that it shoots 1.5' high at 100 yards and go hunting.

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375Brno
.333 member


Reged: 18/10/05
Posts: 354
Loc: Brisbane, Australia
Re: Factory ammo grouping [Re: mlg]
      #46747 - 16/01/06 09:13 PM

mlg

Thanks for that. I will be sticking with the Winchester until I get the reloading organised.

375Fetish

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