Different lots

Just a thought but are you shooting on an outdoor range? I've had amazing results on a warm/dry/NO wind day. Then, a week or 2 later my groups opened up almost 2x. When I was looking at the targets (100 yds) I realized there was a small breeze dropping down the hill and across the range. The groups had a lot more horizontal dispersion than vertical and yes the group was blown across from the wind direction. If you happen to have a wind (even a small breeze) coming from 11 oclock, then switching to 1 oclock, you're in for some nasty results. Just a thought.

I live on an acreage and I shoot from my deck and my yard has a decent shelterbelt. Since I shoot from home I can shoot almost any time, I scan the weather forecasts for some calm days and try to take advantage of them. I cannot eliminate wind from the equation but I do try to minimize it.
 
What ammo has given the best results with your Cooper?

I am going to have to go and reshoot everything on the shelf. There is no clear winner so far.

American Eagle is not the best but it is interesting. At $4.50 a box it is one of the cheapest, it averages 1/2", a few to 3/4" and some to the .2s and .3s.

I went to my local gun store and asked about different lots of Midas+ and they had a brick of a different lot number, picked up a box and I will see if it makes a difference.

The weather forecast says wind in the 5 to 10 k for the next couple of days, will see what happens.
 
What ammo is giving you the best results so far? Surely it is not HV American Eagle.

A scope such as the one used doesn't have the magnification that shooters who regularly shoot the smallest groups use -- except for a few anomalies on the 1/2" challenge in this forum.

It is simply very difficult to shoot consistent small groups with a relatively low powered scope. BR shooters use 36X and more magnification.

Here's what a USBR target 50 yards away looks like at 16X



At 24X



At 36X


Shooting the competition targets shown, I can see where a high magnification scope would be essential.

For a target I use a square, not on a side but up on a corner. This lets me line the cross hairs up with the corners.

I wish I wasn't such a dinosaur, and then I could post pics. Some of this computer stuff is beyond me.
 
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