Is my sizing math/parts correct? (bushing/mandrel)

[Jmccracken1214]

My 6.5 necks measure from the outside, fired : .297
I am using a .287 bushing, so, sized: .287
The mandrel is .2625 i believe, and after running it through the cases I am at .290 outside diameter.

Is this overworking my necks?

 

[spife7980]

That’s almost minimally working the brass. You could get a bushing .289 and skip the mandrel to get the minimum working possible.
But you’re doing what I would do.

 

[ShtrRdy]

What's the neck diameter with a bullet seated in that brass?

 

[Jmccracken1214]

What's the neck diameter with a bullet seated in that brass?

.291

Should I be runnin more neck tension than 1thou

 

[Jmccracken1214]

I had a weird issue months ago, loaded some rounds and shot them about a month later and you could grab the bullet and push/pull it up and down in the case.

I loaded some today, same components and you can’t move the bullet at all. Very strange but those loose rounds still shot a 7 shot group under a half inch lol.

Might pick up a .2615 mandrel and run .002 neck tension to be safe

 

[NighthawkCG]

You may have been getting some spring back with the brass. How many times has it been fired and has it been annealed?

 

[Jmccracken1214]

You may have been getting some spring back with the brass. How many times has it been fired and has it been annealed?

4-5 firings and annealed every time

 

[supercorndogs]

A lot of people end up at .001, it doesn't hurt to test .002 to see if its better. IMO, if .001 shoots, I would load some and go shoot.