Originally Posted by
Ridge Runner
nope ya don't, the brass will easily stretch .007 with the help of the boattail bullet
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
Good point on seating a .264 bullet in a .257 case with a boattail, that obviously was lost on me.
You may very well be right on the fireforming of AI cases not requiring the "jaming" into the lands when forming from the parent case...this is my first AI and my smith and several friends that have them advised doing so to ensure a good fire form and reduce loss from split necks. I have yet to experiene any case loss using the "jamming" processs with heavier bullets...I have witnessed such "loss" watching others fireform...I am sure my day will come.
As always, thanks for your input RR
