Originally Posted by
emtrescue6
I'm guessing there is a small step RR forgot to mention...you need to expand the neck on the 2506 case to .264 using an expander ball from a die to allow for seating the .264 boooolet....
nope ya don't, the brass will easily stretch .007 with the help of the boattail bullet
Originally Posted by
emtrescue6
My experience with the 1 Ackley I have (257 Bob AI), which is new to me...is that best performance comes from fireforming with heavier/longer bullets that you can jam into the lands helps ensure a good formed case and prevents the firing pin from striking the primer just enough to allow the round to travel forward slightly when fired. I have formed just short of 50 Remington cases to date and have had no loss due to cracked necks....so far! If I can fireform an AI successfully my first try, anyone can....LOL
ackley cartridges headspace .004" shorter than the parent case so you do not have to jam them, they are jammed on the datem line or whatever they call the line where the neck contacts the chamber.
The gibbs cracks necks (actualy it splits the shoulder) because not only are you changing the shoulder to 35 degrees, your also moving it foreward about 1/8th". it also doesn't show great accuracy with fireform loads like the AI cartridges, thats why I don't fireform for it with bullets, no use wearing a barrel out with mediocre velocity and accuracy.
see the case on the far left, see the split in the shoulder?
RR