Sizing neck up or sizing neck down

[Feeder calf]

Which would you prefer neck sizing down or up 6 mm Creedmoor? midway has 6mm Creedmoor brass but not 6.5... midsouth has 6.5


Thanks

 

[lash]

I’m confused. What are you trying to accomplish? .250 Creedmoor?

 

[Feeder calf]

Sorry necksize 6 mm Creedmoor up to 6.5 Creedmoor

Or or 6.5 Creedmoor down to 6 mm Creedmoor or does it make any difference

 

[lash]

You are shooting both calibers, I assume and want to purchase just one bulk purchase. Correct?

In general, I prefer to neck up, though in this particular case, it would be easier to just neck down and it shouldn’t make a whole amount of difference. Depending upon which brand of brass you’re buying, you may not even have to turn necks.

 

[Sig Marine]

Personally, I prefer to neck down as necking up can cause more donut issues. This is a common complaint with guys shooting .284 variants and having to neck up Lapua 6.5x.284 brass. This said, if you are keeping the bearing surface/boat-tail junction above the shoulder/neck junction, the donut problem is more or less a moot point. Still, having necked down from a 6.5x47 to a 6x47 and necking up to a .284, I found the process easier when necking down.

 

[garandman]

I would assume "up" sizing (from 6mm to 6.5) stretches / thins the brass, leading to shorter life, neck splits.

"Down" sizing doesn't.... I'm thinking....

 

[Ranger188]

What caliber are you shooting or both?
What brass company are you looking at?
Powdervalleyinc. has both in Lapua and Alpha has both in LRP
If your shooting both, I would buy 100 of each, that way you can keep them
separate and they would have the same number of firings per batch.
I don't think you'd be happy neck sizing down half to get to your 6 creed.
I did it before they came out with factory 6 creed and didn't have a problem.
No reason to do it now with both out. Don't try to save a couple of bucks.


My 2 cents.

 

[Steel head]

I’ve necked up a few hundred 243 cases to 260.
Some brass with a thick shoulder could get you donuts that you’ll have to deal with necking up.

 

[Cascade Hemi]

Sorry necksize 6 mm Creedmoor up to 6.5 Creedmoor

Or or 6.5 Creedmoor down to 6 mm Creedmoor or does it make any difference

For those cartridges, neither. There is a glut of both on the market and the time spent sizing up or down invalidates any savings buying bulk of just one.

 

[lash]

For those cartridges, neither. There is a glut of both on the market and the time spent sizing up or down invalidates any savings buying bulk of just one.

This is probably the best answer to your question.

 

[Bradu]

Neither unless you have to. When there is brass available for both of them, spend the extra $10 in shipping and save yourself the time and aggravation.