308 Brass Growing During Sizing?

[AJC1]

That was going to be my next question, after thinking about it.

If there is no downside to SB dies, why do the die manufacturers produce standard dies in the first place?

I think that's a qualified statement about being in a gas gun. Least that's what I infered.

 

[Varminterror]

If there is no downside to SB dies, why do the die manufacturers produce standard dies in the first place?

Because "very little" downside - while "effectively no downside" - still isn't really "no downside." Again, the qualifiers I offered - loading for multiple barrels, or loading for actions with little to no mechanical advantage for closing or primary extraction.

 

[Charlie98]

Right on!

 

[mdi]

As a matter of physics, brass should always get longer when sized. We’re squishing the same mass into a narrower shape, it’s pretty difficult to accidentally squish brass thicker, so it is more willing to move around. Squeeze a full water bottle sitting on a table - it gets taller.

Yep! When resizing cases, especially rifle cases, no metal is removed, but metal is moved and will normally flow lengthwise, making the case longer...

 

[lightman]

I've never saved any measurements but I've noticed that all bottleneck brass grows. When you shoot it and when you resize it and drag an expander ball through the neck.

 

[Nature Boy]

Anyone ever find the need to trim Ackley Improved cases?

 

[lightman]

The only AI cartridge that I load for is the 22-250 and I have not trimmed them since the very first loading. The standard 22-250 that I loaded for seemed to need trimming pretty often.