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[AlNyhus]

My math says I am only sizing them a total of .011" smaller. Still a lot but I will live with it because it is shooting very small.

Check the math for how much the necks are moving with each firing/sizing/loading cycle. -Al

 

[SmokinJoe]

Isn't .262 a 6mm neck?

 

[NorCalMikie]

Isn't .262 a 6mm neck?

No turn.

 

[searcher]

So...how did you end up with a .262 neck instead of the .255? If your loaded rounds are in the .252 range, the necks are being expanded radially .005 per side each firing (.010 total). Then they're being sized down .011 to .250. Then they come up a couple thou. again when the bullet is seated. Assuming the loaded round is .252, the necks are moving radially a total of .023 each time they are fired, sized and a bullet is seated.

They're going to get pretty hard in a hurry with that much movement. Which is likely why some aren't expanding all the way to .262 when they are fired. And some are being pulled back to .255 due to the excessive hardness. Necks not sealing to the chamber are Bad JuJu for accuracy. The neck tension has to be all over the place. Even annealing has it limits of effectiveness when working with this kind of movement firing after firing.

Hoping you can find a way forward with this. -Al

I agree with all here. This will be a good case for annealing after each firing. Gotta get those necks to seal or they will take forever to blow out