Fire-forming 280 Ackley Improved from Lapua 30-06?

[Joe King]

Thats what I figured, guy at work was swearing up n down it was from to much lube in the die. I asked him why would anyone run a case through a sizing die with case head separation like that? He still insisted it was lube

[Lefty7mmstw]

Originally Posted by Joe King

Thats what I figured, guy at work was swearing up n down it was from to much lube in the die. I asked him why would anyone run a case through a sizing die with case head separation like that? He still insisted it was lube

Same reason-- trapped crap
Entirely different origin though-- as the case ruptures at the start of the firing cycle, a lot of partially burned powder and gas will get trapped, hence the soot and dent. I've seen these twice with the 7stw on brass that was worked for many cycles and a trim or to to much without retiring. A dent like that can happen from poor initial gas pressure too. I've had it with my 300 win with faster powders and light bullets(playing with 125 grain bullets and 4895).

[woods]

Originally Posted by Joe King

I gotta ask. whats the deal with the dent

The gas comes out of the case head separation and is trying to make it's way forward to go out the bore




A dent can happen also from the chamber neck not sealing and gas going back toward the case head but it has happened in every case head separation I have seen or read about

For my 280AI I use the Nosler 280 Remington brass and outside turn for my tight neck before fire forming. Fire forming with 280 Rem brass can be quite accurate and sufficient for any hunting purpose

[barefootserpent]

Originally Posted by barefootserpent

Yes, Lupua seems to be the best and only in 30 06 now a days. But before buying 06 and shooting until it stretches to lenght, check the lenght of the 270. Still no Lupua but yes to Nosler or Norma.
Necking up .10"is less of an adjustment than the .20" down from 30 06. Other options are to get any brand ready to load then weigh very carefully and take the closest to a particular group. Some fill shot cases with water then weigh to check volume. The extra mass of water shows more clearly the volume of each case. Volume is the key to consitent reloads not brass strenght. With this method i acheived .25" 100 yard groups out of a 14" Contender in .223 .
Best to clean, then resize ,then trim. Careful to find a FIRE FORM load reciepe. Shoot. Now reload...good...do it again to expect your best accuracy.
I have two .280's and am always ready for a larger caliber challenge. It always spanks a 7 mag without the slap in the face.

BS

1 Be sure the case is firm against the bolt by touching the bullet to the lands. 2 Use a FIREFORM load not a normal one.

[woods]

IMO seating the bullet to the lands will not prevent the case from moving forward and taking up all available head clearance and reducing headspace (on the case) to zero and even moving the shoulder back a couple of thousands.

The firing pin strike and the primer going off in the primer pocket will push the case forward with several hundred foot pounds (more than enough to seat the bullet further unless you have one helluva crimp). A false shoulder will mitigate case movement forward but will not totally prevent it.

[Buttermilk]

I used to fireform a 30-06 JDJ (T/C Encore wildcat w a short neck, max case capacity) by seating the bullet hard (jammed) against the lands (as JDJones himself recommends ) and have never had a problem fireforming ammo this way.

I also think you could form 280AI using '06 brass. Case would be a bit short but that in and of itself won't be a "problem".

If you have a tight neck 280AI chamber, it may be best to turn necks after sizing down.

Simply sizing the neck down to form the shoulder in the appropriate spot for getting a snug fit in the chamber will also eliminate case stretch.

Regards
Rog

Originally Posted by woods

IMO seating the bullet to the lands will not prevent the case from moving forward and taking up all available head clearance and reducing headspace (on the case) to zero and even moving the shoulder back a couple of thousands.

The firing pin strike and the primer going off in the primer pocket will push the case forward with several hundred foot pounds (more than enough to seat the bullet further unless you have one helluva crimp). A false shoulder will mitigate case movement forward but will not totally prevent it.