Originally Posted by Ridge Runner (Post 3584806)

Ackley improved cartridges are designed to headspace .004" shorter than the parents, so you can shoot 280 factory ammo, or use cornmeal and a papertowel plug if ya don't wanna waste bullets. here's how I turn 270 win cases into 6.5 Gibbs cases

resize to a crush fit in the 6.5 chamber
prime and charge with 11 gr of unique, put a finger over the case mouth and tap once on the bench to settle the powder
fill the case to the top of the case neck with corn meal, put a finger over the casemouth and tap once or so to settle the cornmeal to the bottom of the case neck

now tear a 1.5" wide strip off a paper towel and twist it into a skinny worm, stick it into the case neck, wad it in till full then pinch it off, use a small punch to pack the plug in tight.

keep muzzle pointed down, if you have a brake remove it, watch barrel heat (cause it'll get hot!) clean your barrel well when done, shoulders should come out just rounded on the edges, but will sharpen up nicely on the first full power firing.
RR

Originally Posted by Cut'em Jack (Post 3584868)

So would you expect better results after the second full power firing? Essentially the first full power load would finish the job of the cornmeal and paper towel. Correct?

Might be easier to just shoot some core-loks, at least just for a little pointless range time...Could any accuracy, even remotely, be expected?

Originally Posted by jeepkid (Post 3584978)

I've had fireform loads shoot 1/4" at 100...

Didn't Nosler just come out with .280 AI brass?

Originally Posted by jeepkid (Post 3585023)

I just load up some cheap bullets with a stout (not max, but not min either) load of a cheap powder and go shoot...