I know vapordog, your saying, told you so that neck turning is a waste. But hey, its fun trying. I think it maybe better to buy brass in bulk and go thru it with a neck guage and pick out the pieces with good necks instead of making the brass good.
As close as I recall this is a quote from Layne Simpson....."Such finness things as turning necks (etc.) are only valuable if your gun and cartridges already are shooting 1/2" groups at 100 yards.
I too have turned necks.....deburred flash holes, uniformed primer pockets and have never found those activities to hurt anything......but with frustration I could also never find an advantage as well.
Try this test.....get 25 virgin brass and fire them once all the same and then reload them all identically except for ten of them having the necks turned. Then proceed to get two ten shot groups at the range and observe any differences. A good understanding of statistics is critical to actually saying that there is a real difference....the more often this test is done the more reliable the test is.....I'm all for testing.....that's one of the benefits of reloading. The trick is to not be fooled by the testing.....and that's no easy task.
I do enjoy reading the results of others doing the same testing....almost exclusively they share the same findings as I've had.