Thread: Zeroing - Help! (Real accuracy and precision)

What does this look like with a substantially more mechanically precise rifle?

I went and fired 20 rounds this morning from the Model 7 .223 w/mullerworks cut-rifled barrel. Load was a fairly randomly selected 80gr Targex, CCI450, Ammo Inc 1x fired brass, 24.1gr 2206H, about .015" off the lands. More on this load selection at a later date.

Range 100m precisely.

Group 1



Group 2



Group 3



Group 4



The aggregate 20 round group



The results?

The extreme spread of the 20rd group (100m) is 2.7cm, so about .9MOA.

The mean radius is .7cm (+- .2cm at 95% confidence level) with a SD of 4cm

The mean 5-shot group size is 1.4cm or a little under .5MOA. The largest was about .7MOA, and the smallest was about .3 MOA. I'd be comfortable to say that this rifle system with me shooting it has a precision capability of 1MOA.


The MPOI of each of the 4 groups is shown here, with the shots transformed to be centred on the real MPOI. 2 of the 4 groups give a zero error of 1cm or 1 click.