Got my .243 AI out finally now a couple of Qs. long

[Berniep]

Its a 12lrp action with a criterion .243 AI barrel on it.
For the first 20 rounds I had horizontal stringing issues with the factory federal premium .243 55gr nozlers.
I was very confident in my shots but there would always be fliers. Could just be factory ammo variances.
I took it back to the shop to clean it and after taking the action out of the stock and checking it over really well I fount the big bolt screw loose. I don't know if that would cause the horizontal stringing or not but I took it out for another 15 rounds and it was better but it was getting colder and windier, hard to feel the trigger finger.
Anyway here are the last two 5 shot groups. Then some questions. Seems like its going to be a pretty good shooter if I can get rid of those fliers, kinda like I would be the best race car driver if I could just drive faster


I load my .223 with Wilson hand dies and I neck turn those because its a tight neck chamber.
For the .243 I bought some regular lee collet dies to use for neck sizing and a Wilson bullet seater. Now I am kinda wanting to use a bushing neck die because it works out better fro me not having to get the rock chucker out at all. I kinda wanted to avoid neck turning for this as it not a tight neck chamber and I though I might avoid the hassle. How do you size the bushing if you don't neck turn?
Anyone that has a favorite non varget (don't have any and its scarce around here) .243 ackley loads with light bullets is welcome to share.
btw its a stainless 26 inch 1/14 twist (I don't care about heavy bullets in this one)

[Berniep]

Well I never did get around to buying a concentricity gauge. With Christmas coming up I decided to improvise with what I had around the shop.
It really is a pretty simple principle.
I had a dial indicator setup for degreeing cams, a little 3/8 cold rolled flat bar, take apart a bearing to get the balls, drill a few holes and I can measure banana ammo.
I am pretty sure I found the source of my fliers. Out of the 10 remaining rounds I have 3 measured .010 to .013 run-out. The rest were a pretty consistent 3 thou.
Here is a pic of my new tool.

[dcloco]

Measure runout close to the case neck too.

Definitely think you found quite a bit of the variance though.

[Berniep]

Measure runout close to the case neck too.

Definitely think you found quite a bit of the variance though.

Yes I measure as close to the case neck as possible, I just had it in the vicinity for the picture.
The fired cases measured less than .001 on the neck which I take as a good sign.