18" SPR...

[J Krammes]

Were you getting any mirage? I'd be surprised if you weren't since you shot suppressed and mentioned that you were getting frustrated - which implies maybe you were shooting fast/ getting hot.

That first group was real good. .650" is nothing to sneeze at!

Try several different factory loads and bullet types. The heavy stuff has the sex appeal, but as previously mentioned, you may be better off with a shorter, varmint type projectile at short range.

Nice rig!

No mirage that I noticed. It was about 60* with almost no wind. I am very happy with the .65 group, it is the inconsistancy I don't like. I am going to grab a few different weights and see what it likes.

Jeremy

[DWood]

.....

[ra2bach]

I completely agree with everything you said above.

*BUT* (you knew that was coming, right? lol), my only 'problem' is the industry standard, or lack there of, when it comes to the number of shots used for measuring accuracy.

Statistics likely dictate that the more shots you fire, the more your groups will grow in size, largely due in part to uncontrollable outside factors. I imagine that if one takes 100 3 shot groups, 100 5 shot groups, and 100 10 shot groups...their averages will increase from smallest to largest, respectively.

Since the 'industry standard' has essentially been 3 shots (but now a days its trended towards 5), then I feel it sort of throws a wrench in the mix when we start using 10 shots as the standard for comparison. If for so many years we have called rifles "1/2 MOA accuracy" based upon 3 and 5 shot groups....now suddenly we start using 10 shots as the standard, then would we have to pretty much invalidate all the data we have come to know as the standard? 1/2 MOA rifles of the last 20 years may likely no longer be 1/2 MOA rifles.

Personally, I also feel that a 10 shot group is a better system to use, as more points of measurement always helps eliminate outliers and 'luck'. With that said, I'd be just as comfortable with 5 shot groups, but averaged over a certain number of groups. An average of 5, 5 shot groups would probably be enough to convince me of the inherent accuracy of a rifle. Regardless of the number of shots, I think it's important to be able to say "I can shoot this size group at least 90% of the time".

Maybe we could come up with a formula for converting both 3 and 5 shot groups to '10 shot accuracy'? Heh.

actually 3 shots is only the minimum number of shots that can be used to measure group size as it represents deviation in the second dimension.

statistically, the magic number is 7, more is better. anything less than 7 is statistically unreliable...

[Pappabear]

I have an 18 inch SPR WOA Barrel. It shoots lights out. I shoot 69SMK for tight groups. But it likes much of what I shoot.

I also have seen my AAC M4-2000, open some groups up a bit. You will find sub MOA ammo and be GTG.

And by the way, seems like your gun is shooting pretty good.