Speaking of neck tension (IF)

[justinp61]

Maybe I'm measuring it wrong. I measure the outside of the case after resizing and after seating the bullet.

The .247" bushing acme today, measuring the outside it's now .004".

 

[Mikecr]

You're measuring right.
If a bullet expands a neck 4thou, then the interference was 4thou.

 

[justinp61]

Good deal. When I get a chance I'll load up a few and see how they shoot.

 

[justinp61]

Someone please correct me if I'm wrong with this thinking.

If you take two calibers, say a .22 and a .30 and use .002 IF for both and assuming the same seating depth the force to pull or force the bullet out of the .30 caliber will be more due to greater surface contact area?

 

[Mikecr]

All else equal, yes. You got it.

It's ridiculous for so many to misnomer interference with tension, as there are more attributes affecting tension than mere interference.
It's similar to relating case weight alone with capacity, or holding base to ogive (BTO) alone with any particular notion of meaning.
Same problem really, and the bigger a mob following, the lower it's ability to accept correction (a counter momentum).

This can be overcome, but I can tell you from experience that it takes decades of effort to influence actual change.

 

[justinp61]

Thanks Mike, just wanted to make sure I hadn't trotted out in left field.

 

[Old Rooster]

The way this was explained made sense to me.
When you do something wrong for so long and get acceptable outcomes change is hard but not impossible.
Thanks to all for teaching an old dog new tricks!
Old Rooster