We should be giving our rifles more credit

[robdes]

Some unimportant bs that has probably been discussed before....
We are always talking about a rifles potential accuracy in terms of moa. If a given gun can produce .5" groups at 100, we call it a 1/2moa gun.
But maybe we should call it a 1/4 moa gun. It seems like to consistently produce 1/2 moa groups, the bullet can only deviate 1/4 moa from the aiming point. We are talking diameter when we should be talking radius.

 

[cooper623]

Re: We should be giving our rifles more credit

well calculating the MOA that your gun shoots is more like what youre saying. When done correctly, you take the measurement of the whole group (in inches) and you divide it by 1.047. It may seem like splitting hairs but thats actually what 1 MOA is rounded tot he nearest .001. Then after you have that number you subtract the width of the bullet (aka the caliber) so for example if you shoot a group that measure .750" from end to end (also make sure you measure the 2 farthest away bullet holes) with a .308, it is not a .750 MOA group. its .750/1.047= .716. then you have to take .716-.308 which equals .408. The size of your group is said to be .408 MOA. This measures the max deviation of the dead center of every bullet in your group.

 

[cooper623]

Re: We should be giving our rifles more credit

...also, it takes into account that some calibers are bigger than others. For example, obviously if you didnt do this then your .22 groups would be alot better than your .50 BMG groups.

 

[The Mechanic]

Re: We should be giving our rifles more credit

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dtac</div><div class="ubbcode-body">Some unimportant bs that has probably been discussed before....
We are always talking about a rifles potential accuracy in terms of moa. If a given gun can produce .5" groups at 100, we call it a 1/2moa gun.
But maybe we should call it a 1/4 moa gun. It seems like to consistently produce 1/2 moa groups, the bullet can only deviate 1/4 moa from the aiming point. We are talking diameter when we should be talking radius.

</div></div>
the center of the group is not static and moves each shot as rounds impact further from the farthest impact.

A rifle that can hit .5moa from center target is much more valuable as it takes into consideration your corrections for ENV, and shooter.

 

[robdes]

Re: We should be giving our rifles more credit

Th<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: cooper623</div><div class="ubbcode-body"> This measures the max deviation of the dead center of every bullet in your group. </div></div>

It measures the max distance between the bullets, but not the max distance from the point of aim to the furthest bullet, which might be a more accurate (pun alert) way to discuss it.
If you shot a 100 round group with perfect technique and a 1/2moa gun in .308, I would assume that you would create an almost perfectly circular hole with a diameter of .808". The point of aim would be the center of this circle.
(to all those shooter with guns that can hold 1/2moa all day long, please show us an example of this.). The max deviation from POA to center of bullet would be 1/4". (to keep things simple I am ignoring the diff btwn 1moa and 1" at 100 yards)

In other words, your bullets are always impacting within 1/4moa of your point of aim

 

[The Mechanic]

Re: We should be giving our rifles more credit

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dtac</div><div class="ubbcode-body">In other words, your bullets are always impacting within 1/4moa of your point of aim </div></div>
Point of aim? Or point of impact?

You my friend must be a very good shot.

 

[Swift]

Re: We should be giving our rifles more credit

When I shoot, the bullet normally goes where I want. That's good enough for me.

 

[shane45]

Re: We should be giving our rifles more credit

Well what I think your talking about is addressed in On Target, the software used to measure group size and such. It calls it Average to center. It measures the distance from your aiming point to you impacts. To me this is the important measurment.

 

[GorbashUK]

Re: We should be giving our rifles more credit

I give my trg loads of credit, it always shoots better than me.